21163144424 has 32 divisors (see below), whose sum is σ = 40290349320. Its totient is φ = 10419526656.

The previous prime is 21163144423. The next prime is 21163144477. The reversal of 21163144424 is 42444136112.

It can be written as a sum of positive squares in 4 ways, for example, as 18980572900 + 2182571524 = 137770^2 + 46718^2 .

It is a super-2 number, since 2×21163144424² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21163144423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330962 + ... + 389694.

Almost surely, 2^21163144424 is an apocalyptic number.

It is an amenable number.

21163144424 is a deficient number, since it is larger than the sum of its proper divisors (19127204896).

21163144424 is a wasteful number, since it uses less digits than its factorization.

21163144424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59429 (or 59425 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The spelling of 21163144424 in words is "twenty-one billion, one hundred sixty-three million, one hundred forty-four thousand, four hundred twenty-four".