21054552 has 32 divisors (see below), whose sum is σ = 53233200. Its totient is φ = 6938624.

The previous prime is 21054541. The next prime is 21054559. The reversal of 21054552 is 25545012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2793 + ... + 7064.

Almost surely, 2^21054552 is an apocalyptic number.

It is an amenable number.

21054552 is an abundant number, since it is smaller than the sum of its proper divisors (32178648).

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

21054552 is a wasteful number, since it uses less digits than its factorization.

21054552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9955 (or 9951 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 21054552 is about 4588.5239456714. The cubic root of 21054552 is about 276.1311076327.

Adding to 21054552 its reverse (25545012), we get a palindrome (46599564).

The spelling of 21054552 in words is "twenty-one million, fifty-four thousand, five hundred fifty-two".