21790400092 has 24 divisors (see below), whose sum is σ = 39663816192. Its totient is φ = 10463247600.

The previous prime is 21790400089. The next prime is 21790400143. The reversal of 21790400092 is 29000409712.

It is a happy number.

It is a congruent number.

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, 654478 + ... + 686965.

It is an arithmetic number, because the mean of its divisors is an integer number (1652659008).

Almost surely, 2^21790400092 is an apocalyptic number.

It is an amenable number.

21790400092 is a deficient number, since it is larger than the sum of its proper divisors (17873416100).

21790400092 is a wasteful number, since it uses less digits than its factorization.

21790400092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341609 (or 1341607 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 21790400092 in words is "twenty-one billion, seven hundred ninety million, four hundred thousand, ninety-two".