21152555343215 has 8 divisors (see below), whose sum is σ = 26719017275760. Its totient is φ = 16031410365312.

The previous prime is 21152555343211. The next prime is 21152555343251. The reversal of 21152555343215 is 51234355525112.

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 21152555343215 - 2² = 21152555343211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152555343211) 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, 111329238554 + ... + 111329238743.

It is an arithmetic number, because the mean of its divisors is an integer number (3339877159470).

Almost surely, 2^{21152555343215} is an apocalyptic number.

21152555343215 is a deficient number, since it is larger than the sum of its proper divisors (5566461932545).

21152555343215 is a wasteful number, since it uses less digits than its factorization.

21152555343215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222658477321.

The product of its digits is 900000, while the sum is 44.

The spelling of 21152555343215 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifty-five million, three hundred forty-three thousand, two hundred fifteen".