21516277342215 has 16 divisors (see below), whose sum is σ = 34426146588768. Its totient is φ = 11475313635456.

The previous prime is 21516277342193. The next prime is 21516277342297. The reversal of 21516277342215 is 51224377261512.

It is not a de Polignac number, because 21516277342215 - 2⁹ = 21516277341703 is a prime.

It is a super-2 number, since 2×21516277342215² (a number of 27 digits) contains 22 as substring.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 3530677 + ... + 7449713.

It is an arithmetic number, because the mean of its divisors is an integer number (2151634161798).

Almost surely, 2^{21516277342215} is an apocalyptic number.

21516277342215 is a deficient number, since it is larger than the sum of its proper divisors (12909869246553).

21516277342215 is a wasteful number, since it uses less digits than its factorization.

21516277342215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285058.

The product of its digits is 1411200, while the sum is 48.

The spelling of 21516277342215 in words is "twenty-one trillion, five hundred sixteen billion, two hundred seventy-seven million, three hundred forty-two thousand, two hundred fifteen".