21122030100 has 72 divisors (see below), whose sum is σ = 61154523360. Its totient is φ = 5628721280.

The previous prime is 21122030099. The next prime is 21122030113. The reversal of 21122030100 is 103022112.

It is a super-2 number, since 2×21122030100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 433786 + ... + 480014.

It is an arithmetic number, because the mean of its divisors is an integer number (849368380).

Almost surely, 2^21122030100 is an apocalyptic number.

21122030100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122030100 is an abundant number, since it is smaller than the sum of its proper divisors (40032493260).

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

21122030100 is a wasteful number, since it uses less digits than its factorization.

21122030100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47769 (or 47762 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21122030100 its reverse (103022112), we get a palindrome (21225052212).

The spelling of 21122030100 in words is "twenty-one billion, one hundred twenty-two million, thirty thousand, one hundred".