21354392746 has 8 divisors (see below), whose sum is σ = 32197556484. Its totient is φ = 10621873920.

The previous prime is 21354392737. The next prime is 21354392747. The reversal of 21354392746 is 64729345312.

It can be written as a sum of positive squares in 2 ways, for example, as 21042693721 + 311699025 = 145061^2 + 17655^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21354392696 and 21354392705.

It is not an unprimeable number, because it can be changed into a prime (21354392747) 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 3 ways as a sum of consecutive naturals, for example, 27660745 + ... + 27661516.

Almost surely, 2^21354392746 is an apocalyptic number.

21354392746 is a deficient number, since it is larger than the sum of its proper divisors (10843163738).

21354392746 is a wasteful number, since it uses less digits than its factorization.

21354392746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55322456.

The product of its digits is 1088640, while the sum is 46.

The spelling of 21354392746 in words is "twenty-one billion, three hundred fifty-four million, three hundred ninety-two thousand, seven hundred forty-six".