21115542151315 has 16 divisors (see below), whose sum is σ = 25892905828608. Its totient is φ = 16526882133216.

The previous prime is 21115542151309. The next prime is 21115542151337. The reversal of 21115542151315 is 51315124551112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21115542151315 - 2⁹ = 21115542150803 is a prime.

It is a super-2 number, since 2×21115542151315² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246951549 + ... + 247037038.

It is an arithmetic number, because the mean of its divisors is an integer number (1618306614288).

Almost surely, 2^{21115542151315} is an apocalyptic number.

21115542151315 is a deficient number, since it is larger than the sum of its proper divisors (4777363677293).

21115542151315 is a wasteful number, since it uses less digits than its factorization.

21115542151315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493988778.

The product of its digits is 30000, while the sum is 37.

The spelling of 21115542151315 in words is "twenty-one trillion, one hundred fifteen billion, five hundred forty-two million, one hundred fifty-one thousand, three hundred fifteen".