2121515445455 has 16 divisors (see below), whose sum is σ = 2910565416000. Its totient is φ = 1454224188672.

The previous prime is 2121515445409. The next prime is 2121515445473. The reversal of 2121515445455 is 5545445151212.

It is a cyclic number.

It is not a de Polignac number, because 2121515445455 - 2⁶ = 2121515445391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10928654 + ... + 11121083.

It is an arithmetic number, because the mean of its divisors is an integer number (181910338500).

Almost surely, 2^{2121515445455} is an apocalyptic number.

2121515445455 is a deficient number, since it is larger than the sum of its proper divisors (789049970545).

2121515445455 is a wasteful number, since it uses less digits than its factorization.

2121515445455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22052498.

The product of its digits is 800000, while the sum is 44.

The spelling of 2121515445455 in words is "two trillion, one hundred twenty-one billion, five hundred fifteen million, four hundred forty-five thousand, four hundred fifty-five".