21507092 has 6 divisors (see below), whose sum is σ = 37637418. Its totient is φ = 10753544.

The previous prime is 21507077. The next prime is 21507103. The reversal of 21507092 is 29070512.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 749956 = 4556^2 + 866^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2688383 + ... + 2688390.

It is an arithmetic number, because the mean of its divisors is an integer number (6272903).

Almost surely, 2^21507092 is an apocalyptic number.

It is an amenable number.

21507092 is a deficient number, since it is larger than the sum of its proper divisors (16130326).

21507092 is a wasteful number, since it uses less digits than its factorization.

21507092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376777 (or 5376775 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 21507092 is about 4637.5739347206. The cubic root of 21507092 is about 278.0954591694.

The spelling of 21507092 in words is "twenty-one million, five hundred seven thousand, ninety-two".