21552998 has 8 divisors (see below), whose sum is σ = 33372480. Its totient is φ = 10428840.

The previous prime is 21552983. The next prime is 21553009. The reversal of 21552998 is 89925512.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 173753 + ... + 173876.

It is an arithmetic number, because the mean of its divisors is an integer number (4171560).

Almost surely, 2^21552998 is an apocalyptic number.

21552998 is a deficient number, since it is larger than the sum of its proper divisors (11819482).

21552998 is a wasteful number, since it uses less digits than its factorization.

21552998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347662.

The product of its digits is 64800, while the sum is 41.

The square root of 21552998 is about 4642.5206515427. The cubic root of 21552998 is about 278.2931796530.

The spelling of 21552998 in words is "twenty-one million, five hundred fifty-two thousand, nine hundred ninety-eight".