2180397241921 has 4 divisors (see below), whose sum is σ = 2181737377072. Its totient is φ = 2179057106772.

The previous prime is 2180397241903. The next prime is 2180397241951. The reversal of 2180397241921 is 1291427930812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2180397241921 - 2¹⁵ = 2180397209153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2180397241901) by changing a digit.

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, 670065135 + ... + 670068388.

It is an arithmetic number, because the mean of its divisors is an integer number (545434344268).

Almost surely, 2^{2180397241921} is an apocalyptic number.

It is an amenable number.

2180397241921 is a deficient number, since it is larger than the sum of its proper divisors (1340135151).

2180397241921 is a wasteful number, since it uses less digits than its factorization.

2180397241921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340135150.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 2180397241921 in words is "two trillion, one hundred eighty billion, three hundred ninety-seven million, two hundred forty-one thousand, nine hundred twenty-one".