21068754 has 16 divisors (see below), whose sum is σ = 48157248. Its totient is φ = 6019632.

The previous prime is 21068741. The next prime is 21068807. The reversal of 21068754 is 45786012.

It is a super-2 number, since 2×21068754² = 887784790225032, which contains 22 as substring.

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, 250777 + ... + 250860.

It is an arithmetic number, because the mean of its divisors is an integer number (3009828).

Almost surely, 2^21068754 is an apocalyptic number.

21068754 is an abundant number, since it is smaller than the sum of its proper divisors (27088494).

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

21068754 is a wasteful number, since it uses less digits than its factorization.

21068754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501649.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21068754 is about 4590.0712412772. The cubic root of 21068754 is about 276.1931802361.

The spelling of 21068754 in words is "twenty-one million, sixty-eight thousand, seven hundred fifty-four".