2123121455 has 32 divisors (see below), whose sum is σ = 3155034624. Its totient is φ = 1335574656.

The previous prime is 2123121443. The next prime is 2123121463. The reversal of 2123121455 is 5541213212.

It is not a de Polignac number, because 2123121455 - 2⁶ = 2123121391 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 59852 + ... + 88478.

It is an arithmetic number, because the mean of its divisors is an integer number (98594832).

Almost surely, 2^2123121455 is an apocalyptic number.

2123121455 is a deficient number, since it is larger than the sum of its proper divisors (1031913169).

2123121455 is a wasteful number, since it uses less digits than its factorization.

2123121455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28815.

The product of its digits is 2400, while the sum is 26.

The square root of 2123121455 is about 46077.3420999953. The cubic root of 2123121455 is about 1285.2618390759.

Adding to 2123121455 its reverse (5541213212), we get a palindrome (7664334667).

The spelling of 2123121455 in words is "two billion, one hundred twenty-three million, one hundred twenty-one thousand, four hundred fifty-five".