21726223156 has 24 divisors (see below), whose sum is σ = 41491116576. Its totient is φ = 9872274720.

The previous prime is 21726223147. The next prime is 21726223171. The reversal of 21726223156 is 65132262712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54450 + ... + 215446.

It is an arithmetic number, because the mean of its divisors is an integer number (1728796524).

Almost surely, 2^21726223156 is an apocalyptic number.

It is an amenable number.

21726223156 is a deficient number, since it is larger than the sum of its proper divisors (19764893420).

21726223156 is a wasteful number, since it uses less digits than its factorization.

21726223156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164079 (or 164077 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

Adding to 21726223156 its reverse (65132262712), we get a palindrome (86858485868).

The spelling of 21726223156 in words is "twenty-one billion, seven hundred twenty-six million, two hundred twenty-three thousand, one hundred fifty-six".