21969998472 has 128 divisors (see below), whose sum is σ = 56941885440. Its totient is φ = 7060035840.

The previous prime is 21969998431. The next prime is 21969998483. The reversal of 21969998472 is 27489996912.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23199103 + ... + 23200049.

It is an arithmetic number, because the mean of its divisors is an integer number (444858480).

Almost surely, 2^21969998472 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 21969998472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28470942720).

21969998472 is an abundant number, since it is smaller than the sum of its proper divisors (34971886968).

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

21969998472 is a wasteful number, since it uses less digits than its factorization.

21969998472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291 (or 1287 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 66.

The spelling of 21969998472 in words is "twenty-one billion, nine hundred sixty-nine million, nine hundred ninety-eight thousand, four hundred seventy-two".