21723541292 has 12 divisors (see below), whose sum is σ = 38196370296. Its totient is φ = 10810292640.

The previous prime is 21723541291. The next prime is 21723541303. The reversal of 21723541292 is 29214532712.

It is not an unprimeable number, because it can be changed into a prime (21723541291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12868553 + ... + 12870240.

It is an arithmetic number, because the mean of its divisors is an integer number (3183030858).

Almost surely, 2^21723541292 is an apocalyptic number.

It is an amenable number.

21723541292 is a deficient number, since it is larger than the sum of its proper divisors (16472829004).

21723541292 is a wasteful number, since it uses less digits than its factorization.

21723541292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25739008 (or 25739006 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The spelling of 21723541292 in words is "twenty-one billion, seven hundred twenty-three million, five hundred forty-one thousand, two hundred ninety-two".