21136454 has 8 divisors (see below), whose sum is σ = 31725408. Its totient is φ = 10561320.

The previous prime is 21136441. The next prime is 21136463. The reversal of 21136454 is 45463112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2264 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (3965676).

Almost surely, 2^21136454 is an apocalyptic number.

21136454 is a deficient number, since it is larger than the sum of its proper divisors (10588954).

21136454 is a wasteful number, since it uses less digits than its factorization.

21136454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910.

The product of its digits is 2880, while the sum is 26.

The square root of 21136454 is about 4597.4399397926. The cubic root of 21136454 is about 276.4886934610.

Adding to 21136454 its reverse (45463112), we get a palindrome (66599566).

The spelling of 21136454 in words is "twenty-one million, one hundred thirty-six thousand, four hundred fifty-four".