21540662 has 48 divisors (see below), whose sum is σ = 39414816. Its totient is φ = 8764800.

The previous prime is 21540653. The next prime is 21540677. The reversal of 21540662 is 26604512.

It is a Harshad number since it is a multiple of its sum of digits (26).

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 23 ways as a sum of consecutive naturals, for example, 128903 + ... + 129069.

It is an arithmetic number, because the mean of its divisors is an integer number (821142).

Almost surely, 2^21540662 is an apocalyptic number.

21540662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21540662 is a deficient number, since it is larger than the sum of its proper divisors (17874154).

21540662 is a wasteful number, since it uses less digits than its factorization.

21540662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21540662 is about 4641.1918727844. The cubic root of 21540662 is about 278.2400752103.

The spelling of 21540662 in words is "twenty-one million, five hundred forty thousand, six hundred sixty-two".