21049562 has 4 divisors (see below), whose sum is σ = 31574346. Its totient is φ = 10524780.

The previous prime is 21049543. The next prime is 21049573. The reversal of 21049562 is 26594012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16883881 + 4165681 = 4109^2 + 2041^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5262389 + ... + 5262392.

Almost surely, 2^21049562 is an apocalyptic number.

21049562 is a deficient number, since it is larger than the sum of its proper divisors (10524784).

21049562 is a wasteful number, since it uses less digits than its factorization.

21049562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10524783.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21049562 is about 4587.9801656066. The cubic root of 21049562 is about 276.1092912404.

The spelling of 21049562 in words is "twenty-one million, forty-nine thousand, five hundred sixty-two".