21221121001100 has 72 divisors (see below), whose sum is σ = 47175509407488. Its totient is φ = 8280972403200.

The previous prime is 21221121001063. The next prime is 21221121001111. The reversal of 21221121001100 is 110012112212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83049134 + ... + 83304266.

Almost surely, 2^{21221121001100} is an apocalyptic number.

21221121001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221121001100 is an abundant number, since it is smaller than the sum of its proper divisors (25954388406388).

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

21221121001100 is a wasteful number, since it uses less digits than its factorization.

21221121001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275475 (or 275468 counting only the distinct ones).

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

Adding to 21221121001100 its reverse (110012112212), we get a palindrome (21331133113312).

The spelling of 21221121001100 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one thousand, one hundred".