21202101100 has 36 divisors (see below), whose sum is σ = 46359798408. Its totient is φ = 8416096000.

The previous prime is 21202101073. The next prime is 21202101127. The reversal of 21202101100 is 110120212.

It is an interprime number because it is at equal distance from previous prime (21202101073) and next prime (21202101127).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 796141 + ... + 822340.

It is an arithmetic number, because the mean of its divisors is an integer number (1287772178).

Almost surely, 2^21202101100 is an apocalyptic number.

21202101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202101100 is an abundant number, since it is smaller than the sum of its proper divisors (25157697308).

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

21202101100 is a wasteful number, since it uses less digits than its factorization.

21202101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618626 (or 1618619 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21202101100 its reverse (110120212), we get a palindrome (21312221312).

The spelling of 21202101100 in words is "twenty-one billion, two hundred two million, one hundred one thousand, one hundred".