21353374123 has 16 divisors (see below), whose sum is σ = 22383527040. Its totient is φ = 20349222400.

The previous prime is 21353374111. The next prime is 21353374129. The reversal of 21353374123 is 32147335312.

It is a cyclic number.

It is not a de Polignac number, because 21353374123 - 2²¹ = 21351276971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21353374129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 993333 + ... + 1014601.

It is an arithmetic number, because the mean of its divisors is an integer number (1398970440).

Almost surely, 2^21353374123 is an apocalyptic number.

21353374123 is a deficient number, since it is larger than the sum of its proper divisors (1030152917).

21353374123 is a wasteful number, since it uses less digits than its factorization.

21353374123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21878.

The product of its digits is 45360, while the sum is 34.

The spelling of 21353374123 in words is "twenty-one billion, three hundred fifty-three million, three hundred seventy-four thousand, one hundred twenty-three".