21161734352 has 40 divisors (see below), whose sum is σ = 46171068672. Its totient is φ = 9308678400.

The previous prime is 21161734339. The next prime is 21161734357. The reversal of 21161734352 is 25343716112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161734357) 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 7 ways as a sum of consecutive naturals, for example, 1933853 + ... + 1944764.

Almost surely, 2^21161734352 is an apocalyptic number.

21161734352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21161734352 is an abundant number, since it is smaller than the sum of its proper divisors (25009334320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21161734352 is a wasteful number, since it uses less digits than its factorization.

21161734352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878667 (or 3878661 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The spelling of 21161734352 in words is "twenty-one billion, one hundred sixty-one million, seven hundred thirty-four thousand, three hundred fifty-two".