21120100002 has 32 divisors (see below), whose sum is σ = 47527660800. Its totient is φ = 6950917584.

The previous prime is 21120099997. The next prime is 21120100039. The reversal of 21120100002 is 20000102112.

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

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, 2471133 + ... + 2479664.

It is an arithmetic number, because the mean of its divisors is an integer number (1485239400).

Almost surely, 2^21120100002 is an apocalyptic number.

21120100002 is an abundant number, since it is smaller than the sum of its proper divisors (26407560798).

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

21120100002 is a wasteful number, since it uses less digits than its factorization.

21120100002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950887 (or 4950881 counting only the distinct ones).

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

Adding to 21120100002 its reverse (20000102112), we get a palindrome (41120202114).

The spelling of 21120100002 in words is "twenty-one billion, one hundred twenty million, one hundred thousand, two".