21765054 has 16 divisors (see below), whose sum is σ = 43980048. Its totient is φ = 7180032.

The previous prime is 21765047. The next prime is 21765071. The reversal of 21765054 is 45056712.

It is a congruent 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, 18117 + ... + 19280.

It is an arithmetic number, because the mean of its divisors is an integer number (2748753).

Almost surely, 2^21765054 is an apocalyptic number.

21765054 is an abundant number, since it is smaller than the sum of its proper divisors (22214994).

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

21765054 is a wasteful number, since it uses less digits than its factorization.

21765054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37499.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 21765054 is about 4665.3032055805. The cubic root of 21765054 is about 279.2028945138.

The spelling of 21765054 in words is "twenty-one million, seven hundred sixty-five thousand, fifty-four".