21440554123 has 8 divisors (see below), whose sum is σ = 22712759120. Its totient is φ = 20182724640.

The previous prime is 21440554117. The next prime is 21440554127. The reversal of 21440554123 is 32145504412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21440554123 is a prime.

It is a super-2 number, since 2×21440554123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440554127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3590808 + ... + 3596773.

It is an arithmetic number, because the mean of its divisors is an integer number (2839094890).

Almost surely, 2^21440554123 is an apocalyptic number.

21440554123 is a deficient number, since it is larger than the sum of its proper divisors (1272204997).

21440554123 is a wasteful number, since it uses less digits than its factorization.

21440554123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7187757.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 21440554123 in words is "twenty-one billion, four hundred forty million, five hundred fifty-four thousand, one hundred twenty-three".