21522046 has 16 divisors (see below), whose sum is σ = 39733344. Its totient is φ = 8514144.

The previous prime is 21522037. The next prime is 21522073. The reversal of 21522046 is 64022512.

It is a super-2 number, since 2×21522046² = 926396928052232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58945 + ... + 59308.

It is an arithmetic number, because the mean of its divisors is an integer number (2483334).

Almost surely, 2^21522046 is an apocalyptic number.

21522046 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21522046 is a deficient number, since it is larger than the sum of its proper divisors (18211298).

21522046 is a wasteful number, since it uses less digits than its factorization.

21522046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118275.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21522046 is about 4639.1859199648. The cubic root of 21522046 is about 278.1598980070.

Adding to 21522046 its reverse (64022512), we get a palindrome (85544558).

The spelling of 21522046 in words is "twenty-one million, five hundred twenty-two thousand, forty-six".