21107552 has 12 divisors (see below), whose sum is σ = 41555556. Its totient is φ = 10553760.

The previous prime is 21107543. The next prime is 21107561. The reversal of 21107552 is 25570112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21107543) and next prime (21107561).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329774 + ... + 329837.

It is an arithmetic number, because the mean of its divisors is an integer number (3462963).

Almost surely, 2^21107552 is an apocalyptic number.

It is an amenable number.

21107552 is a deficient number, since it is larger than the sum of its proper divisors (20448004).

21107552 is an equidigital number, since it uses as much as digits as its factorization.

21107552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659621 (or 659613 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 21107552 is about 4594.2955934506. The cubic root of 21107552 is about 276.3626123734.

Adding to 21107552 its reverse (25570112), we get a palindrome (46677664).

The spelling of 21107552 in words is "twenty-one million, one hundred seven thousand, five hundred fifty-two".