21253213545361 has 8 divisors (see below), whose sum is σ = 24289521621120. Its totient is φ = 18216939147648.

The previous prime is 21253213545353. The next prime is 21253213545373. The reversal of 21253213545361 is 16354531235212.

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 21253213545361 - 2³ = 21253213545353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21253213545331) 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, 7052416 + ... + 9604321.

It is an arithmetic number, because the mean of its divisors is an integer number (3036190202640).

Almost surely, 2^{21253213545361} is an apocalyptic number.

It is an amenable number.

21253213545361 is a deficient number, since it is larger than the sum of its proper divisors (3036308075759).

21253213545361 is a wasteful number, since it uses less digits than its factorization.

21253213545361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16839023.

The product of its digits is 648000, while the sum is 43.

The spelling of 21253213545361 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirteen million, five hundred forty-five thousand, three hundred sixty-one".