10221331520 has 56 divisors (see below), whose sum is σ = 24673020504. Its totient is φ = 4032516096.

The previous prime is 10221331517. The next prime is 10221331543. The reversal of 10221331520 is 2513312201.

It can be written as a sum of positive squares in 4 ways, for example, as 266081344 + 9955250176 = 16312^2 + 99776^2 .

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 = 10221331492 and 10221331501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195419 + ... + 242138.

Almost surely, 2^10221331520 is an apocalyptic number.

10221331520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10221331520 is an abundant number, since it is smaller than the sum of its proper divisors (14451688984).

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

10221331520 is an equidigital number, since it uses as much as digits as its factorization.

10221331520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437647 (or 437637 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 10221331520 its reverse (2513312201), we get a palindrome (12734643721).

The spelling of 10221331520 in words is "ten billion, two hundred twenty-one million, three hundred thirty-one thousand, five hundred twenty".