21742296 has 32 divisors (see below), whose sum is σ = 55384560. Its totient is φ = 7110272.

The previous prime is 21742271. The next prime is 21742307. The reversal of 21742296 is 69224712.

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 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, 7275 + ... + 9818.

Almost surely, 2^21742296 is an apocalyptic number.

It is an amenable number.

21742296 is an abundant number, since it is smaller than the sum of its proper divisors (33642264).

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

21742296 is a wasteful number, since it uses less digits than its factorization.

21742296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17155 (or 17151 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 21742296 is about 4662.8634978948. The cubic root of 21742296 is about 279.1055470959.

The spelling of 21742296 in words is "twenty-one million, seven hundred forty-two thousand, two hundred ninety-six".