21221120110000 has 50 divisors (see below), whose sum is σ = 51378453922532. Its totient is φ = 8488448040000.

The previous prime is 21221120109779. The next prime is 21221120110027. The reversal of 21221120110000 is 1102112212.

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1061046006 + ... + 1061066005.

Almost surely, 2^{21221120110000} is an apocalyptic number.

21221120110000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221120110000 is an abundant number, since it is smaller than the sum of its proper divisors (30157333812532).

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

21221120110000 is an equidigital number, since it uses as much as digits as its factorization.

21221120110000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122112039 (or 2122112018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221120110000 its reverse (1102112212), we get a palindrome (21222222222212).

The spelling of 21221120110000 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred ten thousand".