21111002122100 has 36 divisors (see below), whose sum is σ = 49975499571648. Its totient is φ = 7676728044000.

The previous prime is 21111002122069. The next prime is 21111002122123. The reversal of 21111002122100 is 122120011112.

It is a congruent number.

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, 9595908956 + ... + 9595911155.

Almost surely, 2^{21111002122100} is an apocalyptic number.

21111002122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111002122100 is an abundant number, since it is smaller than the sum of its proper divisors (28864497449548).

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

21111002122100 is a wasteful number, since it uses less digits than its factorization.

21111002122100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19191820136 (or 19191820129 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111002122100 its reverse (122120011112), we get a palindrome (21233122133212).

The spelling of 21111002122100 in words is "twenty-one trillion, one hundred eleven billion, two million, one hundred twenty-two thousand, one hundred".