2102012121021 has 16 divisors (see below), whose sum is σ = 2859491666304. Its totient is φ = 1373009736384.

The previous prime is 2102012121007. The next prime is 2102012121031. The reversal of 2102012121021 is 1201212102012.

It is not a de Polignac number, because 2102012121021 - 2⁷ = 2102012120893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102012121031) 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, 8976706 + ... + 9207891.

It is an arithmetic number, because the mean of its divisors is an integer number (178718229144).

Almost surely, 2^{2102012121021} is an apocalyptic number.

It is an amenable number.

2102012121021 is a deficient number, since it is larger than the sum of its proper divisors (757479545283).

2102012121021 is a wasteful number, since it uses less digits than its factorization.

2102012121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18185380.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2102012121021 its reverse (1201212102012), we get a palindrome (3303224223033).

The spelling of 2102012121021 in words is "two trillion, one hundred two billion, twelve million, one hundred twenty-one thousand, twenty-one".