21734881 has 8 divisors (see below), whose sum is σ = 25347200. Its totient is φ = 18629604.

The previous prime is 21734863. The next prime is 21734893. The reversal of 21734881 is 18843712.

It is a happy number.

It is not a de Polignac number, because 21734881 - 2⁷ = 21734753 is a prime.

It is a super-2 number, since 2×21734881² = 944810104168322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21734831) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31341 + ... + 32026.

It is an arithmetic number, because the mean of its divisors is an integer number (3168400).

Almost surely, 2^21734881 is an apocalyptic number.

It is an amenable number.

21734881 is a deficient number, since it is larger than the sum of its proper divisors (3612319).

21734881 is an frugal number, since it uses more digits than its factorization.

21734881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63388 (or 63374 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 21734881 is about 4662.0683178177. The cubic root of 21734881 is about 279.0738147382.

The spelling of 21734881 in words is "twenty-one million, seven hundred thirty-four thousand, eight hundred eighty-one".