21054744 has 24 divisors (see below), whose sum is σ = 57023460. Its totient is φ = 7018224.

The previous prime is 21054703. The next prime is 21054757. The reversal of 21054744 is 44745012.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×21054744³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146142 + ... + 146285.

Almost surely, 2^21054744 is an apocalyptic number.

21054744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21054744 is an abundant number, since it is smaller than the sum of its proper divisors (35968716).

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

21054744 is a wasteful number, since it uses less digits than its factorization.

21054744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292439 (or 292432 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 21054744 is about 4588.5448673844. The cubic root of 21054744 is about 276.1319469921.

Adding to 21054744 its reverse (44745012), we get a palindrome (65799756).

The spelling of 21054744 in words is "twenty-one million, fifty-four thousand, seven hundred forty-four".