21344093281 has 16 divisors (see below), whose sum is σ = 24995013120. Its totient is φ = 17843857920.

The previous prime is 21344093269. The next prime is 21344093291. The reversal of 21344093281 is 18239044312.

It is not a de Polignac number, because 21344093281 - 2²³ = 21335704673 is a prime.

It is a super-2 number, since 2×21344093281² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21344093281.

It is not an unprimeable number, because it can be changed into a prime (21344093291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1374760 + ... + 1390198.

It is an arithmetic number, because the mean of its divisors is an integer number (1562188320).

Almost surely, 2^21344093281 is an apocalyptic number.

It is an amenable number.

21344093281 is a deficient number, since it is larger than the sum of its proper divisors (3650919839).

21344093281 is a wasteful number, since it uses less digits than its factorization.

21344093281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20304.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 21344093281 in words is "twenty-one billion, three hundred forty-four million, ninety-three thousand, two hundred eighty-one".