221020012102100 has 72 divisors (see below), whose sum is σ = 504882261925440. Its totient is φ = 83750634650880.

The previous prime is 221020012102093. The next prime is 221020012102103. The reversal of 221020012102100 is 1201210020122.

It is a super-2 number, since 2×221020012102100² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020012102103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33991304 + ... + 39968096.

Almost surely, 2^{221020012102100} is an apocalyptic number.

221020012102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020012102100 is an abundant number, since it is smaller than the sum of its proper divisors (283862249823340).

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

221020012102100 is a wasteful number, since it uses less digits than its factorization.

221020012102100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996289 (or 5996282 counting only the distinct ones).

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

Adding to 221020012102100 its reverse (1201210020122), we get a palindrome (222221222122222).

The spelling of 221020012102100 in words is "two hundred twenty-one trillion, twenty billion, twelve million, one hundred two thousand, one hundred".