21101111021000 has 64 divisors (see below), whose sum is σ = 49377322500480. Its totient is φ = 8440320868800.

The previous prime is 21101111020999. The next prime is 21101111021021. The reversal of 21101111021000 is 12011110112.

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, 101919587 + ... + 102126413.

It is an arithmetic number, because the mean of its divisors is an integer number (771520664070).

Almost surely, 2^{21101111021000} is an apocalyptic number.

21101111021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101111021000 is an abundant number, since it is smaller than the sum of its proper divisors (28276211479480).

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

21101111021000 is a wasteful number, since it uses less digits than its factorization.

21101111021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308871 (or 308857 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21101111021000 its reverse (12011110112), we get a palindrome (21113122131112).

The spelling of 21101111021000 in words is "twenty-one trillion, one hundred one billion, one hundred eleven million, twenty-one thousand".