21513511222 has 16 divisors (see below), whose sum is σ = 36996654240. Its totient is φ = 9190988928.

The previous prime is 21513511199. The next prime is 21513511231. The reversal of 21513511222 is 22211531512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2419347 + ... + 2428222.

It is an arithmetic number, because the mean of its divisors is an integer number (2312290890).

Almost surely, 2^21513511222 is an apocalyptic number.

21513511222 is a deficient number, since it is larger than the sum of its proper divisors (15483143018).

21513511222 is a wasteful number, since it uses less digits than its factorization.

21513511222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4847895.

The product of its digits is 1200, while the sum is 25.

The spelling of 21513511222 in words is "twenty-one billion, five hundred thirteen million, five hundred eleven thousand, two hundred twenty-two".