21431048 has 16 divisors (see below), whose sum is σ = 40734780. Its totient is φ = 10568448.

The previous prime is 21431023. The next prime is 21431057. The reversal of 21431048 is 84013412.

It can be written as a sum of positive squares in 2 ways, for example, as 21141604 + 289444 = 4598^2 + 538^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17765 + ... + 18932.

Almost surely, 2^21431048 is an apocalyptic number.

It is an amenable number.

21431048 is a deficient number, since it is larger than the sum of its proper divisors (19303732).

21431048 is a wasteful number, since it uses less digits than its factorization.

21431048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36776 (or 36772 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21431048 is about 4629.3679914217. The cubic root of 21431048 is about 277.7673121509.

The spelling of 21431048 in words is "twenty-one million, four hundred thirty-one thousand, forty-eight".