21516164214 has 32 divisors (see below), whose sum is σ = 43132316640. Its totient is φ = 7155412992.

The previous prime is 21516164207. The next prime is 21516164231. The reversal of 21516164214 is 41246161512.

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, 5670702 + ... + 5674494.

It is an arithmetic number, because the mean of its divisors is an integer number (1347884895).

Almost surely, 2^21516164214 is an apocalyptic number.

21516164214 is an abundant number, since it is smaller than the sum of its proper divisors (21616152426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21516164214 is a wasteful number, since it uses less digits than its factorization.

21516164214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5744.

The product of its digits is 11520, while the sum is 33.

The spelling of 21516164214 in words is "twenty-one billion, five hundred sixteen million, one hundred sixty-four thousand, two hundred fourteen".