21443420992 has 56 divisors (see below), whose sum is σ = 48902477760. Its totient is φ = 9138662400.

The previous prime is 21443420981. The next prime is 21443421007. The reversal of 21443420992 is 29902434412.

It is a tau number, because it is divible by the number of its divisors (56).

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, 53509 + ... + 213892.

Almost surely, 2^21443420992 is an apocalyptic number.

It is an amenable number.

21443420992 is an abundant number, since it is smaller than the sum of its proper divisors (27459056768).

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

21443420992 is a wasteful number, since it uses less digits than its factorization.

21443420992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267599 (or 267589 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

It can be divided in two parts, 21443420 and 992, that added together give a palindrome (21444412).

The spelling of 21443420992 in words is "twenty-one billion, four hundred forty-three million, four hundred twenty thousand, nine hundred ninety-two".