21463290 has 24 divisors (see below), whose sum is σ = 55804788. Its totient is φ = 5723520.

The previous prime is 21463289. The next prime is 21463327. The reversal of 21463290 is 9236412.

21463290 is a `hidden beast` number, since 21 + 4 + 632 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 751689 = 4551^2 + 867^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119151 + ... + 119330.

Almost surely, 2^21463290 is an apocalyptic number.

21463290 is an abundant number, since it is smaller than the sum of its proper divisors (34341498).

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

21463290 is a wasteful number, since it uses less digits than its factorization.

21463290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238494 (or 238491 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21463290 is about 4632.8490154547. The cubic root of 21463290 is about 277.9065382906.

It can be divided in two parts, 214 and 63290, that added together give a square (63504 = 252²).

The spelling of 21463290 in words is "twenty-one million, four hundred sixty-three thousand, two hundred ninety".