2105152020021 has 16 divisors (see below), whose sum is σ = 2846462957568. Its totient is φ = 1383638718000.

The previous prime is 2105152019989. The next prime is 2105152020113. The reversal of 2105152020021 is 1200202515012.

It is not a de Polignac number, because 2105152020021 - 2⁵ = 2105152019989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2105152020021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105152020121) 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, 15303096 + ... + 15440046.

It is an arithmetic number, because the mean of its divisors is an integer number (177903934848).

Almost surely, 2^{2105152020021} is an apocalyptic number.

It is an amenable number.

2105152020021 is a deficient number, since it is larger than the sum of its proper divisors (741310937547).

2105152020021 is a wasteful number, since it uses less digits than its factorization.

2105152020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209192.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 2105152020021 its reverse (1200202515012), we get a palindrome (3305354535033).

The spelling of 2105152020021 in words is "two trillion, one hundred five billion, one hundred fifty-two million, twenty thousand, twenty-one".