21438562 has 8 divisors (see below), whose sum is σ = 32187996. Its totient is φ = 10709232.

The previous prime is 21438541. The next prime is 21438589. The reversal of 21438562 is 26583412.

It can be written as a sum of positive squares in 2 ways, for example, as 21261321 + 177241 = 4611^2 + 421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21438562² = 919223881255688, which contains 22 as substring.

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, 1993 + ... + 6844.

Almost surely, 2^21438562 is an apocalyptic number.

21438562 is a deficient number, since it is larger than the sum of its proper divisors (10749434).

21438562 is a wasteful number, since it uses less digits than its factorization.

21438562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052.

The product of its digits is 11520, while the sum is 31.

The square root of 21438562 is about 4630.1794781628. The cubic root of 21438562 is about 277.7997712838.

The spelling of 21438562 in words is "twenty-one million, four hundred thirty-eight thousand, five hundred sixty-two".