21351641514155 has 8 divisors (see below), whose sum is σ = 25622085030912. Its totient is φ = 17081236402048.

The previous prime is 21351641514109. The next prime is 21351641514197. The reversal of 21351641514155 is 55141514615312.

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 21351641514155 - 2¹⁰ = 21351641513131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8363534 + ... + 10613763.

It is an arithmetic number, because the mean of its divisors is an integer number (3202760628864).

Almost surely, 2^{21351641514155} is an apocalyptic number.

21351641514155 is a deficient number, since it is larger than the sum of its proper divisors (4270443516757).

21351641514155 is a wasteful number, since it uses less digits than its factorization.

21351641514155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19202325.

The product of its digits is 360000, while the sum is 44.

The spelling of 21351641514155 in words is "twenty-one trillion, three hundred fifty-one billion, six hundred forty-one million, five hundred fourteen thousand, one hundred fifty-five".