2101220135 has 32 divisors (see below), whose sum is σ = 2921339520. Its totient is φ = 1421088768.

The previous prime is 2101220087. The next prime is 2101220167. The reversal of 2101220135 is 5310221012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2101220135 - 2²⁰ = 2100171559 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2033579 + ... + 2034611.

It is an arithmetic number, because the mean of its divisors is an integer number (91291860).

Almost surely, 2^2101220135 is an apocalyptic number.

2101220135 is a deficient number, since it is larger than the sum of its proper divisors (820119385).

2101220135 is a wasteful number, since it uses less digits than its factorization.

2101220135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2101220135 is about 45839.0677806606. The cubic root of 2101220135 is about 1280.8271295825.

Adding to 2101220135 its reverse (5310221012), we get a palindrome (7411441147).

The spelling of 2101220135 in words is "two billion, one hundred one million, two hundred twenty thousand, one hundred thirty-five".