21054510 has 24 divisors (see below), whose sum is σ = 54741960. Its totient is φ = 5614512.

The previous prime is 21054457. The next prime is 21054521. The reversal of 21054510 is 1545012.

21054510 is a `hidden beast` number, since 210 + 5 + 451 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116880 + ... + 117059.

It is an arithmetic number, because the mean of its divisors is an integer number (2280915).

Almost surely, 2^21054510 is an apocalyptic number.

21054510 is an abundant number, since it is smaller than the sum of its proper divisors (33687450).

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

21054510 is a wasteful number, since it uses less digits than its factorization.

21054510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233952 (or 233949 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 21054510 is about 4588.5193690340. The cubic root of 21054510 is about 276.1309240221.

Adding to 21054510 its reverse (1545012), we get a palindrome (22599522).

The spelling of 21054510 in words is "twenty-one million, fifty-four thousand, five hundred ten".