1031213111220 has 36 divisors (see below), whose sum is σ = 3128013104580. Its totient is φ = 274990162944.

The previous prime is 1031213111197. The next prime is 1031213111239. The reversal of 1031213111220 is 221113121301.

1031213111220 is a `hidden beast` number, since 1 + 0 + 312 + 131 + 1 + 1 + 220 = 666.

1031213111220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 631996380324 + 399216730896 = 794982^2 + 631836^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1031213111193 and 1031213111202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2864480685 + ... + 2864481044.

It is an arithmetic number, because the mean of its divisors is an integer number (86889252905).

Almost surely, 2^{1031213111220} is an apocalyptic number.

1031213111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031213111220 is an abundant number, since it is smaller than the sum of its proper divisors (2096799993360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1031213111220 is a wasteful number, since it uses less digits than its factorization.

1031213111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728961744 (or 5728961739 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1031213111220 its reverse (221113121301), we get a palindrome (1252326232521).

The spelling of 1031213111220 in words is "one trillion, thirty-one billion, two hundred thirteen million, one hundred eleven thousand, two hundred twenty".