21709092 has 12 divisors (see below), whose sum is σ = 50654576. Its totient is φ = 7236360.

The previous prime is 21709091. The next prime is 21709099. The reversal of 21709092 is 29090712.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21709091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904534 + ... + 904557.

Almost surely, 2^21709092 is an apocalyptic number.

It is an amenable number.

21709092 is an abundant number, since it is smaller than the sum of its proper divisors (28945484).

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

21709092 is a wasteful number, since it uses less digits than its factorization.

21709092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809098 (or 1809096 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 21709092 is about 4659.3016644128. The cubic root of 21709092 is about 278.9633949484.

The spelling of 21709092 in words is "twenty-one million, seven hundred nine thousand, ninety-two".