21723227124 has 48 divisors (see below), whose sum is σ = 51752457792. Its totient is φ = 7090488832.

The previous prime is 21723227107. The next prime is 21723227129. The reversal of 21723227124 is 42172232712.

It is a super-2 number, since 2×21723227124² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723227129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16042 + ... + 209054.

It is an arithmetic number, because the mean of its divisors is an integer number (1078176204).

Almost surely, 2^21723227124 is an apocalyptic number.

It is an amenable number.

21723227124 is an abundant number, since it is smaller than the sum of its proper divisors (30029230668).

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

21723227124 is a wasteful number, since it uses less digits than its factorization.

21723227124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193216 (or 193214 counting only the distinct ones).

The product of its digits is 18816, while the sum is 33.

Adding to 21723227124 its reverse (42172232712), we get a palindrome (63895459836).

The spelling of 21723227124 in words is "twenty-one billion, seven hundred twenty-three million, two hundred twenty-seven thousand, one hundred twenty-four".