21221102002100 has 216 divisors, whose sum is σ = 62168814566208. Its totient is φ = 6105571430400.

The previous prime is 21221102002091. The next prime is 21221102002129. The reversal of 21221102002100 is 120020112212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6852509 + ... + 9455108.

Almost surely, 2^{21221102002100} is an apocalyptic number.

21221102002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221102002100 is an abundant number, since it is smaller than the sum of its proper divisors (40947712564108).

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

21221102002100 is a wasteful number, since it uses less digits than its factorization.

21221102002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16307675 (or 16307655 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221102002100 its reverse (120020112212), we get a palindrome (21341122114312).

The spelling of 21221102002100 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, two thousand, one hundred".