21445767437432 has 64 divisors (see below), whose sum is σ = 43731609492480. Its totient is φ = 9800328350592.

The previous prime is 21445767437399. The next prime is 21445767437453. The reversal of 21445767437432 is 23473476754412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65855633 + ... + 66180479.

It is an arithmetic number, because the mean of its divisors is an integer number (683306398320).

Almost surely, 2^{21445767437432} 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 21445767437432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21865804746240).

21445767437432 is an abundant number, since it is smaller than the sum of its proper divisors (22285842055048).

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

21445767437432 is a wasteful number, since it uses less digits than its factorization.

21445767437432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331132 (or 331128 counting only the distinct ones).

The product of its digits is 94832640, while the sum is 59.

The spelling of 21445767437432 in words is "twenty-one trillion, four hundred forty-five billion, seven hundred sixty-seven million, four hundred thirty-seven thousand, four hundred thirty-two".