21520468 has 12 divisors (see below), whose sum is σ = 38536960. Its totient is φ = 10509912.

The previous prime is 21520463. The next prime is 21520481. The reversal of 21520468 is 86402512.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520463) 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, 62388 + ... + 62731.

Almost surely, 2^21520468 is an apocalyptic number.

It is an amenable number.

21520468 is a deficient number, since it is larger than the sum of its proper divisors (17016492).

21520468 is a wasteful number, since it uses less digits than its factorization.

21520468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125166 (or 125164 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21520468 is about 4639.0158439048. The cubic root of 21520468 is about 278.1530995975.

The spelling of 21520468 in words is "twenty-one million, five hundred twenty thousand, four hundred sixty-eight".