21221111021000 has 128 divisors (see below), whose sum is σ = 56039699664000. Its totient is φ = 7450672096000.

The previous prime is 21221111020997. The next prime is 21221111021039. The reversal of 21221111021000 is 12011112212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32942930 + ... + 33580929.

It is an arithmetic number, because the mean of its divisors is an integer number (437810153625).

Almost surely, 2^{21221111021000} is an apocalyptic number.

21221111021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221111021000 is an abundant number, since it is smaller than the sum of its proper divisors (34818588643000).

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

21221111021000 is a wasteful number, since it uses less digits than its factorization.

21221111021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66523920 (or 66523906 counting only the distinct ones).

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

Adding to 21221111021000 its reverse (12011112212), we get a palindrome (21233122133212).

It can be divided in two parts, 212211 and 11021000, that added together give a palindrome (11233211).

The spelling of 21221111021000 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-one thousand".