21249052 has 36 divisors (see below), whose sum is σ = 41865208. Its totient is φ = 9424800.

The previous prime is 21249047. The next prime is 21249073. The reversal of 21249052 is 25094212.

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, 20302 + ... + 21322.

Almost surely, 2^21249052 is an apocalyptic number.

21249052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21249052 is a deficient number, since it is larger than the sum of its proper divisors (20616156).

21249052 is a wasteful number, since it uses less digits than its factorization.

21249052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21249052 is about 4609.6694024626. The cubic root of 21249052 is about 276.9787938776.

The spelling of 21249052 in words is "twenty-one million, two hundred forty-nine thousand, fifty-two".