21022201320 has 64 divisors (see below), whose sum is σ = 63337360320. Its totient is φ = 5581853184.

The previous prime is 21022201283. The next prime is 21022201349. The reversal of 21022201320 is 2310222012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21022201320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347974 + ... + 403893.

It is an arithmetic number, because the mean of its divisors is an integer number (989646255).

Almost surely, 2^21022201320 is an apocalyptic number.

21022201320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022201320 is an abundant number, since it is smaller than the sum of its proper divisors (42315159000).

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

21022201320 is a wasteful number, since it uses less digits than its factorization.

21022201320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752114 (or 752110 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21022201320 its reverse (2310222012), we get a palindrome (23332423332).

The spelling of 21022201320 in words is "twenty-one billion, twenty-two million, two hundred one thousand, three hundred twenty".