21155152615351 has 32 divisors (see below), whose sum is σ = 22295518502400. Its totient is φ = 20046152730240.

The previous prime is 21155152615349. The next prime is 21155152615369. The reversal of 21155152615351 is 15351625155112.

It is a cyclic number.

It is not a de Polignac number, because 21155152615351 - 2¹ = 21155152615349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21155152615298 and 21155152615307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155152685351) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 296176120 + ... + 296247538.

It is an arithmetic number, because the mean of its divisors is an integer number (696734953200).

Almost surely, 2^{21155152615351} is an apocalyptic number.

21155152615351 is a deficient number, since it is larger than the sum of its proper divisors (1140365887049).

21155152615351 is a wasteful number, since it uses less digits than its factorization.

21155152615351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72439.

The product of its digits is 225000, while the sum is 43.

The spelling of 21155152615351 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-two million, six hundred fifteen thousand, three hundred fifty-one".