21111021092 has 24 divisors (see below), whose sum is σ = 42313656000. Its totient is φ = 9027948960.

The previous prime is 21111021059. The next prime is 21111021101. The reversal of 21111021092 is 29012011112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804842 + ... + 830657.

It is an arithmetic number, because the mean of its divisors is an integer number (1763069000).

Almost surely, 2^21111021092 is an apocalyptic number.

It is an amenable number.

21111021092 is an abundant number, since it is smaller than the sum of its proper divisors (21202634908).

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

21111021092 is a wasteful number, since it uses less digits than its factorization.

21111021092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635971 (or 1635969 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 21111021092 in words is "twenty-one billion, one hundred eleven million, twenty-one thousand, ninety-two".