2123215155 has 24 divisors (see below), whose sum is σ = 3692022048. Its totient is φ = 1128756096.

The previous prime is 2123215151. The next prime is 2123215181. The reversal of 2123215155 is 5515123212.

2123215155 is a `hidden beast` number, since 2 + 123 + 21 + 515 + 5 = 666.

It is not a de Polignac number, because 2123215155 - 2² = 2123215151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123215151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61287 + ... + 89456.

It is an arithmetic number, because the mean of its divisors is an integer number (153834252).

Almost surely, 2^2123215155 is an apocalyptic number.

2123215155 is a deficient number, since it is larger than the sum of its proper divisors (1568806893).

2123215155 is a wasteful number, since it uses less digits than its factorization.

2123215155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151067 (or 151064 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 2123215155 is about 46078.3588574940. The cubic root of 2123215155 is about 1285.2807463414.

Adding to 2123215155 its reverse (5515123212), we get a palindrome (7638338367).

The spelling of 2123215155 in words is "two billion, one hundred twenty-three million, two hundred fifteen thousand, one hundred fifty-five".