21898252 has 6 divisors (see below), whose sum is σ = 38321948. Its totient is φ = 10949124.

The previous prime is 21898249. The next prime is 21898267. The reversal of 21898252 is 25289812.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2737278 + ... + 2737285.

Almost surely, 2^21898252 is an apocalyptic number.

It is an amenable number.

21898252 is a deficient number, since it is larger than the sum of its proper divisors (16423696).

21898252 is a wasteful number, since it uses less digits than its factorization.

21898252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474567 (or 5474565 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 21898252 is about 4679.5568166227. The cubic root of 21898252 is about 279.7712928321.

The spelling of 21898252 in words is "twenty-one million, eight hundred ninety-eight thousand, two hundred fifty-two".