21263896 has 16 divisors (see below), whose sum is σ = 40244040. Its totient is φ = 10532160.

The previous prime is 21263867. The next prime is 21263897. The reversal of 21263896 is 69836212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263897) 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, 11565 + ... + 13276.

Almost surely, 2^21263896 is an apocalyptic number.

It is an amenable number.

21263896 is a deficient number, since it is larger than the sum of its proper divisors (18980144).

21263896 is a wasteful number, since it uses less digits than its factorization.

21263896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24954 (or 24950 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 21263896 is about 4611.2792151419. The cubic root of 21263896 is about 277.0432754398.

The spelling of 21263896 in words is "twenty-one million, two hundred sixty-three thousand, eight hundred ninety-six".