2121210645255 has 96 divisors (see below), whose sum is σ = 3969336571200. Its totient is φ = 1041721841664.

The previous prime is 2121210645247. The next prime is 2121210645269. The reversal of 2121210645255 is 5525460121212.

2121210645255 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 2 + 1 + 0 + 645 + 2 + 5 + 5 = 666.

It is not a de Polignac number, because 2121210645255 - 2³ = 2121210645247 is a prime.

It is a super-3 number, since 3×2121210645255³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 714451411 + ... + 714454379.

It is an arithmetic number, because the mean of its divisors is an integer number (41347255950).

Almost surely, 2^{2121210645255} is an apocalyptic number.

2121210645255 is a deficient number, since it is larger than the sum of its proper divisors (1848125925945).

2121210645255 is a wasteful number, since it uses less digits than its factorization.

2121210645255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5585 (or 5582 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 2121210645255 its reverse (5525460121212), we get a palindrome (7646670766467).

The spelling of 2121210645255 in words is "two trillion, one hundred twenty-one billion, two hundred ten million, six hundred forty-five thousand, two hundred fifty-five".