2101012020021 has 16 divisors (see below), whose sum is σ = 2891845877760. Its totient is φ = 1355430496560.

The previous prime is 2101012020017. The next prime is 2101012020043. The reversal of 2101012020021 is 1200202101012.

It is not a de Polignac number, because 2101012020021 - 2² = 2101012020017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101012019979 and 2101012020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101012020011) 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, 1611076 + ... + 2607218.

It is an arithmetic number, because the mean of its divisors is an integer number (180740367360).

Almost surely, 2^{2101012020021} is an apocalyptic number.

It is an amenable number.

2101012020021 is a deficient number, since it is larger than the sum of its proper divisors (790833857739).

2101012020021 is a wasteful number, since it uses less digits than its factorization.

2101012020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018856.

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

Adding to 2101012020021 its reverse (1200202101012), we get a palindrome (3301214121033).

The spelling of 2101012020021 in words is "two trillion, one hundred one billion, twelve million, twenty thousand, twenty-one".