2155432505221 has 8 divisors (see below), whose sum is σ = 2160297172800. Its totient is φ = 2150568123648.

The previous prime is 2155432505209. The next prime is 2155432505251. The reversal of 2155432505221 is 1225052345512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155432505221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155432505251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24447600 + ... + 24535606.

It is an arithmetic number, because the mean of its divisors is an integer number (270037146600).

Almost surely, 2^{2155432505221} is an apocalyptic number.

It is an amenable number.

2155432505221 is a deficient number, since it is larger than the sum of its proper divisors (4864667579).

2155432505221 is an equidigital number, since it uses as much as digits as its factorization.

2155432505221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143003.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 2155432505221 in words is "two trillion, one hundred fifty-five billion, four hundred thirty-two million, five hundred five thousand, two hundred twenty-one".