1031221033220 has 48 divisors (see below), whose sum is σ = 2554766957568. Its totient is φ = 342156286080.

The previous prime is 1031221033211. The next prime is 1031221033229. The reversal of 1031221033220 is 223301221301.

It is an interprime number because it is at equal distance from previous prime (1031221033211) and next prime (1031221033229).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1031221033192 and 1031221033201.

It is not an unprimeable number, because it can be changed into a prime (1031221033229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118799927 + ... + 118808606.

It is an arithmetic number, because the mean of its divisors is an integer number (53224311616).

Almost surely, 2^{1031221033220} is an apocalyptic number.

1031221033220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031221033220 is an abundant number, since it is smaller than the sum of its proper divisors (1523545924348).

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

1031221033220 is a wasteful number, since it uses less digits than its factorization.

1031221033220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237608580 (or 237608578 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1031221033220 its reverse (223301221301), we get a palindrome (1254522254521).

The spelling of 1031221033220 in words is "one trillion, thirty-one billion, two hundred twenty-one million, thirty-three thousand, two hundred twenty".