21159902 has 8 divisors (see below), whose sum is σ = 31930416. Its totient is φ = 10516432.

The previous prime is 21159899. The next prime is 21159907. The reversal of 21159902 is 20995112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21159907) 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, 31343 + ... + 32010.

It is an arithmetic number, because the mean of its divisors is an integer number (3991302).

Almost surely, 2^21159902 is an apocalyptic number.

21159902 is a deficient number, since it is larger than the sum of its proper divisors (10770514).

21159902 is a wasteful number, since it uses less digits than its factorization.

21159902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63522.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 21159902 is about 4599.9893478138. The cubic root of 21159902 is about 276.5908977851.

The spelling of 21159902 in words is "twenty-one million, one hundred fifty-nine thousand, nine hundred two".