21223355832 has 256 divisors, whose sum is σ = 75095424000. Its totient is φ = 5406621696.

The previous prime is 21223355827. The next prime is 21223355843. The reversal of 21223355832 is 23855332212.

21223355832 is a `hidden beast` number, since 2 + 1 + 223 + 355 + 83 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 466648 + ... + 510104.

It is an arithmetic number, because the mean of its divisors is an integer number (293341500).

Almost surely, 2^21223355832 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 21223355832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37547712000).

21223355832 is an abundant number, since it is smaller than the sum of its proper divisors (53872068168).

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

21223355832 is a wasteful number, since it uses less digits than its factorization.

21223355832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43515 (or 43505 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 21223355832 in words is "twenty-one billion, two hundred twenty-three million, three hundred fifty-five thousand, eight hundred thirty-two".