21442201984 has 64 divisors (see below), whose sum is σ = 48881296800. Its totient is φ = 9177845760.

The previous prime is 21442201943. The next prime is 21442202021. The reversal of 21442201984 is 48910224412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710074 + ... + 739654.

Almost surely, 2^21442201984 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 21442201984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24440648400).

21442201984 is an abundant number, since it is smaller than the sum of its proper divisors (27439094816).

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

21442201984 is an equidigital number, since it uses as much as digits as its factorization.

21442201984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30411 (or 30399 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 21442201984 in words is "twenty-one billion, four hundred forty-two million, two hundred one thousand, nine hundred eighty-four".