2145205152021 has 8 divisors (see below), whose sum is σ = 2958903658080. Its totient is φ = 1380821706992.

The previous prime is 2145205152019. The next prime is 2145205152047. The reversal of 2145205152021 is 1202515025412.

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 2145205152021 - 2¹ = 2145205152019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2145205152021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145205152011) 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, 12328765155 + ... + 12328765328.

It is an arithmetic number, because the mean of its divisors is an integer number (369862957260).

Almost surely, 2^{2145205152021} is an apocalyptic number.

It is an amenable number.

2145205152021 is a deficient number, since it is larger than the sum of its proper divisors (813698506059).

2145205152021 is a wasteful number, since it uses less digits than its factorization.

2145205152021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24657530515.

The product of its (nonzero) digits is 8000, while the sum is 30.

The spelling of 2145205152021 in words is "two trillion, one hundred forty-five billion, two hundred five million, one hundred fifty-two thousand, twenty-one".