2101621135 has 4 divisors (see below), whose sum is σ = 2521945368. Its totient is φ = 1681296904.

The previous prime is 2101621117. The next prime is 2101621139. The reversal of 2101621135 is 5311261012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101621135 - 2¹⁵ = 2101588367 is a prime.

It is a super-2 number, since 2×2101621135² = 8833622790157376450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101621139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210162109 + ... + 210162118.

It is an arithmetic number, because the mean of its divisors is an integer number (630486342).

Almost surely, 2^2101621135 is an apocalyptic number.

2101621135 is a deficient number, since it is larger than the sum of its proper divisors (420324233).

2101621135 is an equidigital number, since it uses as much as digits as its factorization.

2101621135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420324232.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2101621135 is about 45843.4415701963. The cubic root of 2101621135 is about 1280.9086027229.

Adding to 2101621135 its reverse (5311261012), we get a palindrome (7412882147).

The spelling of 2101621135 in words is "two billion, one hundred one million, six hundred twenty-one thousand, one hundred thirty-five".