21002452 has 12 divisors (see below), whose sum is σ = 36874656. Its totient is φ = 10466840.

The previous prime is 21002431. The next prime is 21002461. The reversal of 21002452 is 25420012.

It is a super-2 number, since 2×21002452² = 882205980024608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7198 + ... + 9685.

It is an arithmetic number, because the mean of its divisors is an integer number (3072888).

Almost surely, 2^21002452 is an apocalyptic number.

It is an amenable number.

21002452 is a deficient number, since it is larger than the sum of its proper divisors (15872204).

21002452 is a wasteful number, since it uses less digits than its factorization.

21002452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17198 (or 17196 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 21002452 is about 4582.8432222802. The cubic root of 21002452 is about 275.9031551283.

Adding to 21002452 its reverse (25420012), we get a palindrome (46422464).

The spelling of 21002452 in words is "twenty-one million, two thousand, four hundred fifty-two".