21121111000 has 64 divisors (see below), whose sum is σ = 53916464160. Its totient is φ = 7680400000.

The previous prime is 21121110977. The next prime is 21121111019. The reversal of 21121111000 is 11112112.

It is a super-2 number, since 2×21121111000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949051 + ... + 971050.

Almost surely, 2^21121111000 is an apocalyptic number.

21121111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121111000 is an abundant number, since it is smaller than the sum of its proper divisors (32795353160).

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

21121111000 is a wasteful number, since it uses less digits than its factorization.

21121111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920133 (or 1920119 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21121111000 its reverse (11112112), we get a palindrome (21132223112).

The spelling of 21121111000 in words is "twenty-one billion, one hundred twenty-one million, one hundred eleven thousand".