21361992 has 16 divisors (see below), whose sum is σ = 53405040. Its totient is φ = 7120656.

The previous prime is 21361957. The next prime is 21362041. The reversal of 21361992 is 29916312.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445018 + ... + 445065.

It is an arithmetic number, because the mean of its divisors is an integer number (3337815).

Almost surely, 2^21361992 is an apocalyptic number.

It is an amenable number.

21361992 is an abundant number, since it is smaller than the sum of its proper divisors (32043048).

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

21361992 is a wasteful number, since it uses less digits than its factorization.

21361992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890092 (or 890088 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 21361992 is about 4621.9035039689. The cubic root of 21361992 is about 277.4686467296.

The spelling of 21361992 in words is "twenty-one million, three hundred sixty-one thousand, nine hundred ninety-two".