21850396 has 6 divisors (see below), whose sum is σ = 38238200. Its totient is φ = 10925196.

The previous prime is 21850393. The next prime is 21850429. The reversal of 21850396 is 69305812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2731296 + ... + 2731303.

Almost surely, 2^21850396 is an apocalyptic number.

It is an amenable number.

21850396 is a deficient number, since it is larger than the sum of its proper divisors (16387804).

21850396 is a wasteful number, since it uses less digits than its factorization.

21850396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5462603 (or 5462601 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21850396 is about 4674.4407152086. The cubic root of 21850396 is about 279.5673420022.

It can be divided in two parts, 218 and 50396, that multiplied together give a triangular number (10986328 = T₄₆₈₇).

The spelling of 21850396 in words is "twenty-one million, eight hundred fifty thousand, three hundred ninety-six".