21463508 has 48 divisors (see below), whose sum is σ = 43352064. Its totient is φ = 9203040.

The previous prime is 21463499. The next prime is 21463529. The reversal of 21463508 is 80536412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128441 + ... + 128607.

It is an arithmetic number, because the mean of its divisors is an integer number (903168).

Almost surely, 2^21463508 is an apocalyptic number.

It is an amenable number.

21463508 is an abundant number, since it is smaller than the sum of its proper divisors (21888556).

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

21463508 is a wasteful number, since it uses less digits than its factorization.

21463508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21463508 is about 4632.8725430342. The cubic root of 21463508 is about 277.9074791749.

It can be divided in two parts, 21463 and 508, that multiplied together give a square (10903204 = 3302²).

The spelling of 21463508 in words is "twenty-one million, four hundred sixty-three thousand, five hundred eight".