21115032670 has 16 divisors (see below), whose sum is σ = 38022288480. Its totient is φ = 8442628704.

The previous prime is 21115032661. The next prime is 21115032689. The reversal of 21115032670 is 7623051112.

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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396765 + ... + 446824.

It is an arithmetic number, because the mean of its divisors is an integer number (2376393030).

Almost surely, 2^21115032670 is an apocalyptic number.

21115032670 is a deficient number, since it is larger than the sum of its proper divisors (16907255810).

21115032670 is a wasteful number, since it uses less digits than its factorization.

21115032670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846099.

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 21115032670 its reverse (7623051112), we get a palindrome (28738083782).

The spelling of 21115032670 in words is "twenty-one billion, one hundred fifteen million, thirty-two thousand, six hundred seventy".