21001002002010 has 96 divisors (see below), whose sum is σ = 56014429685760. Its totient is φ = 5456533353984.

The previous prime is 21001002001951. The next prime is 21001002002039. The reversal of 21001002002010 is 1020020010012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001002001983 and 21001002002001.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10188495 + ... + 12075074.

It is an arithmetic number, because the mean of its divisors is an integer number (583483642560).

Almost surely, 2^{21001002002010} is an apocalyptic number.

21001002002010 is an abundant number, since it is smaller than the sum of its proper divisors (35013427683750).

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

21001002002010 is a wasteful number, since it uses less digits than its factorization.

21001002002010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22263852 (or 22263849 counting only the distinct ones).

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

Adding to 21001002002010 its reverse (1020020010012), we get a palindrome (22021022012022).

The spelling of 21001002002010 in words is "twenty-one trillion, one billion, two million, two thousand, ten".