21013158 has 16 divisors (see below), whose sum is σ = 42716016. Its totient is φ = 6889440.

The previous prime is 21013127. The next prime is 21013159. The reversal of 21013158 is 85131012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28341 + ... + 29072.

It is an arithmetic number, because the mean of its divisors is an integer number (2669751).

Almost surely, 2^21013158 is an apocalyptic number.

21013158 is an abundant number, since it is smaller than the sum of its proper divisors (21702858).

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

21013158 is a wasteful number, since it uses less digits than its factorization.

21013158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57479.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 21013158 is about 4584.0111256409. The cubic root of 21013158 is about 275.9500277096.

The spelling of 21013158 in words is "twenty-one million, thirteen thousand, one hundred fifty-eight".