21223699279872 has 416 divisors, whose sum is σ = 62085599228160. Its totient is φ = 6421862154240.

The previous prime is 21223699279759. The next prime is 21223699279873. The reversal of 21223699279872 is 27897299632212.

It is a super-2 number, since 2×21223699279872² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21223699279797 and 21223699279806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223699279873) 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 31 ways as a sum of consecutive naturals, for example, 653201547 + ... + 653234037.

Almost surely, 2^{21223699279872} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21223699279872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31042799614080).

21223699279872 is an abundant number, since it is smaller than the sum of its proper divisors (40861899948288).

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

21223699279872 is a wasteful number, since it uses less digits than its factorization.

21223699279872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32647 (or 32625 counting only the distinct ones).

The product of its digits is 164602368, while the sum is 69.

The spelling of 21223699279872 in words is "twenty-one trillion, two hundred twenty-three billion, six hundred ninety-nine million, two hundred seventy-nine thousand, eight hundred seventy-two".