21520348 has 12 divisors (see below), whose sum is σ = 37698640. Its totient is φ = 10749312.

The previous prime is 21520307. The next prime is 21520361. The reversal of 21520348 is 84302512.

It is a super-2 number, since 2×21520348² = 926250756082208, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

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, 3148 + ... + 7276.

Almost surely, 2^21520348 is an apocalyptic number.

It is an amenable number.

21520348 is a deficient number, since it is larger than the sum of its proper divisors (16178292).

21520348 is a wasteful number, since it uses less digits than its factorization.

21520348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5436 (or 5434 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21520348 is about 4639.0029101090. The cubic root of 21520348 is about 278.1525825946.

The spelling of 21520348 in words is "twenty-one million, five hundred twenty thousand, three hundred forty-eight".