21943167642 has 24 divisors (see below), whose sum is σ = 51865669440. Its totient is φ = 6649444680.

The previous prime is 21943167613. The next prime is 21943167647. The reversal of 21943167642 is 24676134912.

It is not an unprimeable number, because it can be changed into a prime (21943167647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55411842 + ... + 55412237.

It is an arithmetic number, because the mean of its divisors is an integer number (2161069560).

Almost surely, 2^21943167642 is an apocalyptic number.

21943167642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21943167642 is an abundant number, since it is smaller than the sum of its proper divisors (29922501798).

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

21943167642 is a wasteful number, since it uses less digits than its factorization.

21943167642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110824098 (or 110824095 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 21943167642 in words is "twenty-one billion, nine hundred forty-three million, one hundred sixty-seven thousand, six hundred forty-two".