21110000002 has 128 divisors (see below), whose sum is σ = 43054018560. Its totient is φ = 7524679680.

The previous prime is 21109999993. The next prime is 21110000003. The reversal of 21110000002 is 20000001112.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a self number, because there is not a number n which added to its sum of digits gives 21110000002.

It is not an unprimeable number, because it can be changed into a prime (21110000003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9302524 + ... + 9304792.

It is an arithmetic number, because the mean of its divisors is an integer number (336359520).

Almost surely, 2^21110000002 is an apocalyptic number.

21110000002 is an abundant number, since it is smaller than the sum of its proper divisors (21944018558).

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

21110000002 is a wasteful number, since it uses less digits than its factorization.

21110000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21110000002 its reverse (20000001112), we get a palindrome (41110001114).

The spelling of 21110000002 in words is "twenty-one billion, one hundred ten million, two", and thus it is an aban number.