21036158 has 16 divisors (see below), whose sum is σ = 37071216. Its totient is φ = 8826240.

The previous prime is 21036151. The next prime is 21036163. The reversal of 21036158 is 85163012.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036151) 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, 36491 + ... + 37062.

It is an arithmetic number, because the mean of its divisors is an integer number (2316951).

Almost surely, 2^21036158 is an apocalyptic number.

21036158 is a deficient number, since it is larger than the sum of its proper divisors (16035058).

21036158 is a wasteful number, since it uses less digits than its factorization.

21036158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73579.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21036158 is about 4586.5191594498. The cubic root of 21036158 is about 276.0506715759.

The spelling of 21036158 in words is "twenty-one million, thirty-six thousand, one hundred fifty-eight".