21754902 has 16 divisors (see below), whose sum is σ = 46856880. Its totient is φ = 6693792.

The previous prime is 21754891. The next prime is 21754961. The reversal of 21754902 is 20945712.

It is a super-2 number, since 2×21754902² = 946551522059208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21754902.

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, 139377 + ... + 139532.

It is an arithmetic number, because the mean of its divisors is an integer number (2928555).

Almost surely, 2^21754902 is an apocalyptic number.

21754902 is an abundant number, since it is smaller than the sum of its proper divisors (25101978).

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

21754902 is a wasteful number, since it uses less digits than its factorization.

21754902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278927.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21754902 is about 4664.2150465003. The cubic root of 21754902 is about 279.1594776892.

The spelling of 21754902 in words is "twenty-one million, seven hundred fifty-four thousand, nine hundred two".