21122011320 has 64 divisors (see below), whose sum is σ = 63493200000. Its totient is φ = 5621232768.

The previous prime is 21122011283. The next prime is 21122011321. The reversal of 21122011320 is 2311022112.

It is a super-2 number, since 2×21122011320² (a number of 21 digits) contains 22 as substring.

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 21122011320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122011321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116490 + ... + 236249.

It is an arithmetic number, because the mean of its divisors is an integer number (992081250).

Almost surely, 2^21122011320 is an apocalyptic number.

21122011320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122011320 is an abundant number, since it is smaller than the sum of its proper divisors (42371188680).

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

21122011320 is a wasteful number, since it uses less digits than its factorization.

21122011320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353252 (or 353248 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21122011320 its reverse (2311022112), we get a palindrome (23433033432).

The spelling of 21122011320 in words is "twenty-one billion, one hundred twenty-two million, eleven thousand, three hundred twenty".