21054518 has 8 divisors (see below), whose sum is σ = 32600640. Its totient is φ = 10187640.

The previous prime is 21054457. The next prime is 21054521. The reversal of 21054518 is 81545012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169733 + ... + 169856.

It is an arithmetic number, because the mean of its divisors is an integer number (4075080).

Almost surely, 2^21054518 is an apocalyptic number.

21054518 is a deficient number, since it is larger than the sum of its proper divisors (11546122).

21054518 is a wasteful number, since it uses less digits than its factorization.

21054518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339622.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 21054518 is about 4588.5202407748. The cubic root of 21054518 is about 276.1309589956.

The spelling of 21054518 in words is "twenty-one million, fifty-four thousand, five hundred eighteen".