21700292 has 12 divisors (see below), whose sum is σ = 38144400. Its totient is φ = 10801896.

The previous prime is 21700291. The next prime is 21700297. The reversal of 21700292 is 29200712.

It is not an unprimeable number, because it can be changed into a prime (21700291) 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, 11042 + ... + 12857.

It is an arithmetic number, because the mean of its divisors is an integer number (3178700).

Almost surely, 2^21700292 is an apocalyptic number.

It is an amenable number.

21700292 is a deficient number, since it is larger than the sum of its proper divisors (16444108).

21700292 is a wasteful number, since it uses less digits than its factorization.

21700292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24130 (or 24128 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21700292 is about 4658.3572211671. The cubic root of 21700292 is about 278.9256963096.

The spelling of 21700292 in words is "twenty-one million, seven hundred thousand, two hundred ninety-two".