21153052 has 12 divisors (see below), whose sum is σ = 37173136. Its totient is φ = 10532160.

The previous prime is 21153047. The next prime is 21153053. The reversal of 21153052 is 25035112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10008 + ... + 11935.

Almost surely, 2^21153052 is an apocalyptic number.

It is an amenable number.

21153052 is a deficient number, since it is larger than the sum of its proper divisors (16020084).

21153052 is a wasteful number, since it uses less digits than its factorization.

21153052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22188 (or 22186 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21153052 is about 4599.2447206036. The cubic root of 21153052 is about 276.5610480543.

Adding to 21153052 its reverse (25035112), we get a palindrome (46188164).

The spelling of 21153052 in words is "twenty-one million, one hundred fifty-three thousand, fifty-two".