21221001121000 has 64 divisors (see below), whose sum is σ = 49954491175680. Its totient is φ = 8437571636800.

The previous prime is 21221001120899. The next prime is 21221001121037. The reversal of 21221001121000 is 12110012212.

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, 63368932 + ... + 63702931.

It is an arithmetic number, because the mean of its divisors is an integer number (780538924620).

Almost surely, 2^{21221001121000} is an apocalyptic number.

21221001121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221001121000 is an abundant number, since it is smaller than the sum of its proper divisors (28733490054680).

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

21221001121000 is a wasteful number, since it uses less digits than its factorization.

21221001121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127072051 (or 127072037 counting only the distinct ones).

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

Adding to 21221001121000 its reverse (12110012212), we get a palindrome (21233111133212).

The spelling of 21221001121000 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred twenty-one thousand".