21011011080 has 64 divisors (see below), whose sum is σ = 63044533440. Its totient is φ = 5601914112.

The previous prime is 21011011079. The next prime is 21011011111. The reversal of 21011011080 is 8011011012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 830782 + ... + 855698.

It is an arithmetic number, because the mean of its divisors is an integer number (985070835).

Almost surely, 2^21011011080 is an apocalyptic number.

21011011080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011011080 is an abundant number, since it is smaller than the sum of its proper divisors (42033522360).

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

21011011080 is a wasteful number, since it uses less digits than its factorization.

21011011080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31958 (or 31954 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011011080 its reverse (8011011012), we get a palindrome (29022022092).

The spelling of 21011011080 in words is "twenty-one billion, eleven million, eleven thousand, eighty".