21356514 has 16 divisors (see below), whose sum is σ = 47459040. Its totient is φ = 7118820.

The previous prime is 21356507. The next prime is 21356549. The reversal of 21356514 is 41565312.

21356514 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 651 + 4 = 666.

It is a super-2 number, since 2×21356514² = 912201380464392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197692 + ... + 197799.

It is an arithmetic number, because the mean of its divisors is an integer number (2966190).

Almost surely, 2^21356514 is an apocalyptic number.

21356514 is an abundant number, since it is smaller than the sum of its proper divisors (26102526).

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

21356514 is a wasteful number, since it uses less digits than its factorization.

21356514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395502 (or 395496 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 21356514 is about 4621.3108529940. The cubic root of 21356514 is about 277.4449269817. Note that the first 3 decimals are identical.

It can be divided in two parts, 2135 and 6514, that added together give a square (8649 = 93²).

The spelling of 21356514 in words is "twenty-one million, three hundred fifty-six thousand, five hundred fourteen".