21011110000 has 50 divisors (see below), whose sum is σ = 50870022632. Its totient is φ = 8404440000.

The previous prime is 21011109979. The next prime is 21011110007. The reversal of 21011110000 is 1111012.

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011110007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1040556 + ... + 1060555.

Almost surely, 2^21011110000 is an apocalyptic number.

21011110000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011110000 is an abundant number, since it is smaller than the sum of its proper divisors (29858912632).

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

21011110000 is an equidigital number, since it uses as much as digits as its factorization.

21011110000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101139 (or 2101118 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21011110000 its reverse (1111012), we get a palindrome (21012221012).

The spelling of 21011110000 in words is "twenty-one billion, eleven million, one hundred ten thousand".