21080416940 has 24 divisors (see below), whose sum is σ = 48293319312. Its totient is φ = 7665606080.

The previous prime is 21080416927. The next prime is 21080416943. The reversal of 21080416940 is 4961408012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21080416940.

It is not an unprimeable number, because it can be changed into a prime (21080416943) 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, 47909819 + ... + 47910258.

It is an arithmetic number, because the mean of its divisors is an integer number (2012221638).

Almost surely, 2^21080416940 is an apocalyptic number.

21080416940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21080416940 is an abundant number, since it is smaller than the sum of its proper divisors (27212902372).

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

21080416940 is a wasteful number, since it uses less digits than its factorization.

21080416940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95820097 (or 95820095 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 21080416940 in words is "twenty-one billion, eighty million, four hundred sixteen thousand, nine hundred forty".