2145205145221 has 8 divisors (see below), whose sum is σ = 2258496864000. Its totient is φ = 2031952044960.

The previous prime is 2145205145189. The next prime is 2145205145227. The reversal of 2145205145221 is 1225415025412.

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

It is a cyclic number.

It is not a de Polignac number, because 2145205145221 - 2⁵ = 2145205145189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145205145227) 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, 9540565 + ... + 9762826.

It is an arithmetic number, because the mean of its divisors is an integer number (282312108000).

Almost surely, 2^{2145205145221} is an apocalyptic number.

It is an amenable number.

2145205145221 is a deficient number, since it is larger than the sum of its proper divisors (113291718779).

2145205145221 is a wasteful number, since it uses less digits than its factorization.

2145205145221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19309259.

The product of its (nonzero) digits is 32000, while the sum is 34.

The spelling of 2145205145221 in words is "two trillion, one hundred forty-five billion, two hundred five million, one hundred forty-five thousand, two hundred twenty-one".