21054052 has 24 divisors (see below), whose sum is σ = 39082400. Its totient is φ = 9896256.

The previous prime is 21054049. The next prime is 21054067. The reversal of 21054052 is 25045012.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 9568 + ... + 11560.

Almost surely, 2^21054052 is an apocalyptic number.

It is an amenable number.

21054052 is a deficient number, since it is larger than the sum of its proper divisors (18028348).

21054052 is a wasteful number, since it uses less digits than its factorization.

21054052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21054052 is about 4588.4694615961. The cubic root of 21054052 is about 276.1289217768.

Adding to 21054052 its reverse (25045012), we get a palindrome (46099064).

The spelling of 21054052 in words is "twenty-one million, fifty-four thousand, fifty-two".