21383158 has 4 divisors (see below), whose sum is σ = 32074740. Its totient is φ = 10691578.

The previous prime is 21383143. The next prime is 21383177. The reversal of 21383158 is 85138312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5345788 + ... + 5345791.

It is an arithmetic number, because the mean of its divisors is an integer number (8018685).

Almost surely, 2^21383158 is an apocalyptic number.

21383158 is a deficient number, since it is larger than the sum of its proper divisors (10691582).

21383158 is a wasteful number, since it uses less digits than its factorization.

21383158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10691581.

The product of its digits is 5760, while the sum is 31.

The square root of 21383158 is about 4624.1926862967. The cubic root of 21383158 is about 277.5602574553.

The spelling of 21383158 in words is "twenty-one million, three hundred eighty-three thousand, one hundred fifty-eight".