1211331020220 has 96 divisors (see below), whose sum is σ = 3898536667200. Its totient is φ = 311882925312.

The previous prime is 1211331020213. The next prime is 1211331020233. The reversal of 1211331020220 is 220201331121.

1211331020220 is a `hidden beast` number, since 1 + 2 + 113 + 310 + 20 + 220 = 666.

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 = 1211331020193 and 1211331020202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38660299 + ... + 38691618.

It is an arithmetic number, because the mean of its divisors is an integer number (40609756950).

Almost surely, 2^{1211331020220} is an apocalyptic number.

1211331020220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211331020220 is an abundant number, since it is smaller than the sum of its proper divisors (2687205646980).

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

1211331020220 is a wasteful number, since it uses less digits than its factorization.

1211331020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77351964 (or 77351956 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1211331020220 its reverse (220201331121), we get a palindrome (1431532351341).

The spelling of 1211331020220 in words is "one trillion, two hundred eleven billion, three hundred thirty-one million, twenty thousand, two hundred twenty".