21041968488 has 32 divisors (see below), whose sum is σ = 52748280960. Its totient is φ = 6994874880.

The previous prime is 21041968481. The next prime is 21041968529. The reversal of 21041968488 is 88486914012.

It is a super-2 number, since 2×21041968488² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21041968488.

It is not an unprimeable number, because it can be changed into a prime (21041968481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1185673 + ... + 1203288.

It is an arithmetic number, because the mean of its divisors is an integer number (1648383780).

Almost surely, 2^21041968488 is an apocalyptic number.

It is an amenable number.

21041968488 is an abundant number, since it is smaller than the sum of its proper divisors (31706312472).

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

21041968488 is a wasteful number, since it uses less digits than its factorization.

21041968488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389337 (or 2389333 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 51.

The spelling of 21041968488 in words is "twenty-one billion, forty-one million, nine hundred sixty-eight thousand, four hundred eighty-eight".