21002110002 has 32 divisors (see below), whose sum is σ = 46685717760. Its totient is φ = 6998549040.

The previous prime is 21002109979. The next prime is 21002110007. The reversal of 21002110002 is 20001120012.

It is a super-2 number, since 2×21002110002² (a number of 21 digits) contains 22 as substring.

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 (21002110007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122352 + ... + 238692.

It is an arithmetic number, because the mean of its divisors is an integer number (1458928680).

Almost surely, 2^21002110002 is an apocalyptic number.

21002110002 is an abundant number, since it is smaller than the sum of its proper divisors (25683607758).

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

21002110002 is a wasteful number, since it uses less digits than its factorization.

21002110002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119695 (or 119689 counting only the distinct ones).

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

Adding to 21002110002 its reverse (20001120012), we get a palindrome (41003230014).

The spelling of 21002110002 in words is "twenty-one billion, two million, one hundred ten thousand, two".