21152521214 has 64 divisors (see below), whose sum is σ = 37079285760. Its totient is φ = 8959356000.

The previous prime is 21152521211. The next prime is 21152521219. The reversal of 21152521214 is 41212525112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152521211) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2077067 + ... + 2087225.

It is an arithmetic number, because the mean of its divisors is an integer number (579363840).

Almost surely, 2^21152521214 is an apocalyptic number.

21152521214 is a deficient number, since it is larger than the sum of its proper divisors (15926764546).

21152521214 is a wasteful number, since it uses less digits than its factorization.

21152521214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10317.

The product of its digits is 1600, while the sum is 26.

The spelling of 21152521214 in words is "twenty-one billion, one hundred fifty-two million, five hundred twenty-one thousand, two hundred fourteen".