21152141366399 has 4 divisors (see below), whose sum is σ = 21346197709320. Its totient is φ = 20958085023480.

The previous prime is 21152141366357. The next prime is 21152141366437. The reversal of 21152141366399 is 99366314125112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21152141366399 - 2⁸ = 21152141366143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21152141366399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152149366399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97028171297 + ... + 97028171514.

It is an arithmetic number, because the mean of its divisors is an integer number (5336549427330).

Almost surely, 2^{21152141366399} is an apocalyptic number.

21152141366399 is a deficient number, since it is larger than the sum of its proper divisors (194056342921).

21152141366399 is a wasteful number, since it uses less digits than its factorization.

21152141366399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194056342920.

The product of its digits is 2099520, while the sum is 53.

The spelling of 21152141366399 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred forty-one million, three hundred sixty-six thousand, three hundred ninety-nine".