21001112000 has 112 divisors (see below), whose sum is σ = 56737605600. Its totient is φ = 7636736000.

The previous prime is 21001111997. The next prime is 21001112023. The reversal of 21001112000 is 21110012.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

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, 31325 + ... + 207324.

Almost surely, 2^21001112000 is an apocalyptic number.

21001112000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001112000 is an abundant number, since it is smaller than the sum of its proper divisors (35736493600).

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

21001112000 is a wasteful number, since it uses less digits than its factorization.

21001112000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238687 (or 238667 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21001112000 its reverse (21110012), we get a palindrome (21022222012).

The spelling of 21001112000 in words is "twenty-one billion, one million, one hundred twelve thousand".