2123155331 has 4 divisors (see below), whose sum is σ = 2316169464. Its totient is φ = 1930141200.

The previous prime is 2123155283. The next prime is 2123155339. The reversal of 2123155331 is 1335513212.

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 2123155331 - 2⁶ = 2123155267 is a prime.

It is a super-2 number, since 2×2123155331² = 9015577119107439122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123155331.

It is not an unprimeable number, because it can be changed into a prime (2123155339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96507050 + ... + 96507071.

It is an arithmetic number, because the mean of its divisors is an integer number (579042366).

Almost surely, 2^2123155331 is an apocalyptic number.

2123155331 is a deficient number, since it is larger than the sum of its proper divisors (193014133).

2123155331 is a wasteful number, since it uses less digits than its factorization.

2123155331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193014132.

The product of its digits is 2700, while the sum is 26.

The square root of 2123155331 is about 46077.7096978572. The cubic root of 2123155331 is about 1285.2686748127.

Adding to 2123155331 its reverse (1335513212), we get a palindrome (3458668543).

The spelling of 2123155331 in words is "two billion, one hundred twenty-three million, one hundred fifty-five thousand, three hundred thirty-one".