21101200002 has 24 divisors (see below), whose sum is σ = 47412573936. Its totient is φ = 7033733172.

The previous prime is 21101199991. The next prime is 21101200007. The reversal of 21101200002 is 20000210112.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21101200007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21708568 + ... + 21709539.

It is an arithmetic number, because the mean of its divisors is an integer number (1975523914).

Almost surely, 2^21101200002 is an apocalyptic number.

21101200002 is an abundant number, since it is smaller than the sum of its proper divisors (26311373934).

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

21101200002 is an equidigital number, since it uses as much as digits as its factorization.

21101200002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43418124 (or 43418112 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21101200002 its reverse (20000210112), we get a palindrome (41101410114).

The spelling of 21101200002 in words is "twenty-one billion, one hundred one million, two hundred thousand, two".