21101011002 has 32 divisors (see below), whose sum is σ = 46899989760. Its totient is φ = 7032342240.

The previous prime is 21101010977. The next prime is 21101011033. The reversal of 21101011002 is 20011010112.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276102 + ... + 344142.

It is an arithmetic number, because the mean of its divisors is an integer number (1465624680).

Almost surely, 2^21101011002 is an apocalyptic number.

21101011002 is an abundant number, since it is smaller than the sum of its proper divisors (25798978758).

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

21101011002 is a wasteful number, since it uses less digits than its factorization.

21101011002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73795 (or 73789 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21101011002 its reverse (20011010112), we get a palindrome (41112021114).

The spelling of 21101011002 in words is "twenty-one billion, one hundred one million, eleven thousand, two".