2120636157 has 4 divisors (see below), whose sum is σ = 2827514880. Its totient is φ = 1413757436.

The previous prime is 2120636129. The next prime is 2120636173. The reversal of 2120636157 is 7516360212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2120636157 - 2¹⁰ = 2120635133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120636657) 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, 353439357 + ... + 353439362.

It is an arithmetic number, because the mean of its divisors is an integer number (706878720).

Almost surely, 2^2120636157 is an apocalyptic number.

It is an amenable number.

2120636157 is a deficient number, since it is larger than the sum of its proper divisors (706878723).

2120636157 is an equidigital number, since it uses as much as digits as its factorization.

2120636157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706878722.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 2120636157 is about 46050.3654382894. The cubic root of 2120636157 is about 1284.7601397395.

Adding to 2120636157 its reverse (7516360212), we get a palindrome (9636996369).

The spelling of 2120636157 in words is "two billion, one hundred twenty million, six hundred thirty-six thousand, one hundred fifty-seven".