2102210001021 has 48 divisors (see below), whose sum is σ = 3158798926976. Its totient is φ = 1236129890688.

The previous prime is 2102210001007. The next prime is 2102210001037. The reversal of 2102210001021 is 1201000122012.

It is not a de Polignac number, because 2102210001021 - 2²⁷ = 2102075783293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102210000988 and 2102210001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102210002021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19897491 + ... + 20002863.

Almost surely, 2^{2102210001021} is an apocalyptic number.

It is an amenable number.

2102210001021 is a deficient number, since it is larger than the sum of its proper divisors (1056588925955).

2102210001021 is a wasteful number, since it uses less digits than its factorization.

2102210001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106402 (or 106379 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2102210001021 its reverse (1201000122012), we get a palindrome (3303210123033).

The spelling of 2102210001021 in words is "two trillion, one hundred two billion, two hundred ten million, one thousand, twenty-one".