21136154 has 12 divisors (see below), whose sum is σ = 34331166. Its totient is φ = 9754992.

The previous prime is 21136153. The next prime is 21136183. The reversal of 21136154 is 45163112.

It can be written as a sum of positive squares in 3 ways, for example, as 13490929 + 7645225 = 3673^2 + 2765^2 .

It is not an unprimeable number, because it can be changed into a prime (21136153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30929 + ... + 31604.

Almost surely, 2^21136154 is an apocalyptic number.

21136154 is a deficient number, since it is larger than the sum of its proper divisors (13195012).

21136154 is a wasteful number, since it uses less digits than its factorization.

21136154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62561 (or 62548 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 21136154 is about 4597.4073128232. The cubic root of 21136154 is about 276.4873853418.

Adding to 21136154 its reverse (45163112), we get a palindrome (66299266).

The spelling of 21136154 in words is "twenty-one million, one hundred thirty-six thousand, one hundred fifty-four".