21313158 has 16 divisors (see below), whose sum is σ = 42746880. Its totient is φ = 7084296.

The previous prime is 21313133. The next prime is 21313181. The reversal of 21313158 is 85131312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2638 + ... + 7041.

It is an arithmetic number, because the mean of its divisors is an integer number (2671680).

Almost surely, 2^21313158 is an apocalyptic number.

21313158 is an abundant number, since it is smaller than the sum of its proper divisors (21433722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21313158 is a wasteful number, since it uses less digits than its factorization.

21313158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10051.

The product of its digits is 720, while the sum is 24.

The square root of 21313158 is about 4616.6175930003. The cubic root of 21313158 is about 277.2570521967.

The spelling of 21313158 in words is "twenty-one million, three hundred thirteen thousand, one hundred fifty-eight".