2135699871021 has 16 divisors (see below), whose sum is σ = 3164371816320. Its totient is φ = 1423632510720.

The previous prime is 2135699870939. The next prime is 2135699871029. The reversal of 2135699871021 is 1201789965312.

It is a happy number.

2135699871021 is a `hidden beast` number, since 2 + 1 + 3 + 569 + 9 + 8 + 71 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 2135699871021 - 2⁷ = 2135699870893 is a prime.

It is a super-2 number, since 2×2135699871021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135699871029) 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, 4415985 + ... + 4875686.

It is an arithmetic number, because the mean of its divisors is an integer number (197773238520).

Almost surely, 2^{2135699871021} is an apocalyptic number.

It is an amenable number.

2135699871021 is a deficient number, since it is larger than the sum of its proper divisors (1028671945299).

2135699871021 is an equidigital number, since it uses as much as digits as its factorization.

2135699871021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9300193 (or 9300187 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 2135699871021 in words is "two trillion, one hundred thirty-five billion, six hundred ninety-nine million, eight hundred seventy-one thousand, twenty-one".