2121255445 has 16 divisors (see below), whose sum is σ = 2629048320. Its totient is φ = 1641369600.

The previous prime is 2121255413. The next prime is 2121255449. The reversal of 2121255445 is 5445521212.

It is not a de Polignac number, because 2121255445 - 2⁵ = 2121255413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121255449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513940 + ... + 518050.

It is an arithmetic number, because the mean of its divisors is an integer number (164315520).

Almost surely, 2^2121255445 is an apocalyptic number.

It is an amenable number.

2121255445 is a deficient number, since it is larger than the sum of its proper divisors (507792875).

2121255445 is a wasteful number, since it uses less digits than its factorization.

2121255445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7476.

The product of its digits is 16000, while the sum is 31.

The square root of 2121255445 is about 46057.0889766168. The cubic root of 2121255445 is about 1284.8851901240.

Adding to 2121255445 its reverse (5445521212), we get a palindrome (7566776657).

The spelling of 2121255445 in words is "two billion, one hundred twenty-one million, two hundred fifty-five thousand, four hundred forty-five".