21152516154314 has 16 divisors (see below), whose sum is σ = 32516252201160. Its totient is φ = 10313981379840.

The previous prime is 21152516154307. The next prime is 21152516154433. The reversal of 21152516154314 is 41345161525112.

It can be written as a sum of positive squares in 4 ways, for example, as 5762328235225 + 15390187919089 = 2400485^2 + 3923033^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53792699 + ... + 54184494.

Almost surely, 2^{21152516154314} is an apocalyptic number.

21152516154314 is a deficient number, since it is larger than the sum of its proper divisors (11363736046846).

21152516154314 is a wasteful number, since it uses less digits than its factorization.

21152516154314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107979625.

The product of its digits is 144000, while the sum is 41.

Adding to 21152516154314 its reverse (41345161525112), we get a palindrome (62497677679426).

The spelling of 21152516154314 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred sixteen million, one hundred fifty-four thousand, three hundred fourteen".