21134554 has 32 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 8805888.

The previous prime is 21134527. The next prime is 21134569. The reversal of 21134554 is 45543112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107184 + ... + 107380.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^21134554 is an apocalyptic number.

21134554 is a deficient number, since it is larger than the sum of its proper divisors (16121126).

21134554 is a wasteful number, since it uses less digits than its factorization.

21134554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382.

The product of its digits is 2400, while the sum is 25.

The square root of 21134554 is about 4597.2332984089. The cubic root of 21134554 is about 276.4804084973.

Adding to 21134554 its reverse (45543112), we get a palindrome (66677666).

The spelling of 21134554 in words is "twenty-one million, one hundred thirty-four thousand, five hundred fifty-four".