21121211102000 has 80 divisors (see below), whose sum is σ = 51576743278944. Its totient is φ = 8364836000000.

The previous prime is 21121211101993. The next prime is 21121211102029. The reversal of 21121211102000 is 20111212112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21121211102000² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52078226 + ... + 52482225.

Almost surely, 2^{21121211102000} is an apocalyptic number.

21121211102000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121211102000 is an abundant number, since it is smaller than the sum of its proper divisors (30455532176944).

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

21121211102000 is a wasteful number, since it uses less digits than its factorization.

21121211102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104560575 (or 104560559 counting only the distinct ones).

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

Adding to 21121211102000 its reverse (20111212112), we get a palindrome (21141322314112).

The spelling of 21121211102000 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, one hundred two thousand".