2154211345863 has 12 divisors (see below), whose sum is σ = 3187532235888. Its totient is φ = 1401113070240.

The previous prime is 2154211345777. The next prime is 2154211345903. The reversal of 2154211345863 is 3685431124512.

2154211345863 is a `hidden beast` number, since 2 + 1 + 54 + 2 + 1 + 13 + 4 + 586 + 3 = 666.

It is not a de Polignac number, because 2154211345863 - 2⁸ = 2154211345607 is a prime.

It is a super-3 number, since 3×2154211345863³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154211345163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2918985195 + ... + 2918985932.

It is an arithmetic number, because the mean of its divisors is an integer number (265627686324).

Almost surely, 2^{2154211345863} is an apocalyptic number.

2154211345863 is a deficient number, since it is larger than the sum of its proper divisors (1033320890025).

2154211345863 is a wasteful number, since it uses less digits than its factorization.

2154211345863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5837971174 (or 5837971171 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 2154211345863 in words is "two trillion, one hundred fifty-four billion, two hundred eleven million, three hundred forty-five thousand, eight hundred sixty-three".