21351099674 has 8 divisors (see below), whose sum is σ = 32071823220. Its totient is φ = 10660491936.

The previous prime is 21351099673. The next prime is 21351099761. The reversal of 21351099674 is 47699015312.

It can be written as a sum of positive squares in 2 ways, for example, as 18263630449 + 3087469225 = 135143^2 + 55565^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21351099673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7527179 + ... + 7530014.

Almost surely, 2^21351099674 is an apocalyptic number.

21351099674 is a deficient number, since it is larger than the sum of its proper divisors (10720723546).

21351099674 is a wasteful number, since it uses less digits than its factorization.

21351099674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15057904.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 21351099674 in words is "twenty-one billion, three hundred fifty-one million, ninety-nine thousand, six hundred seventy-four".