2154212261616 has 20 divisors (see below), whose sum is σ = 5565048342632. Its totient is φ = 718070753856.

The previous prime is 2154212261561. The next prime is 2154212261653. The reversal of 2154212261616 is 6161622124512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22439711011 + ... + 22439711106.

Almost surely, 2^{2154212261616} is an apocalyptic number.

It is an amenable number.

2154212261616 is an abundant number, since it is smaller than the sum of its proper divisors (3410836081016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2154212261616 is a wasteful number, since it uses less digits than its factorization.

2154212261616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44879422128 (or 44879422122 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The spelling of 2154212261616 in words is "two trillion, one hundred fifty-four billion, two hundred twelve million, two hundred sixty-one thousand, six hundred sixteen".