21009065762 has 16 divisors (see below), whose sum is σ = 31935109920. Its totient is φ = 10364956992.

The previous prime is 21009065741. The next prime is 21009065767. The reversal of 21009065762 is 26756090012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21009065767) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 186503 + ... + 277130.

It is an arithmetic number, because the mean of its divisors is an integer number (1995944370).

Almost surely, 2^21009065762 is an apocalyptic number.

21009065762 is a deficient number, since it is larger than the sum of its proper divisors (10926044158).

21009065762 is a wasteful number, since it uses less digits than its factorization.

21009065762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463937.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 21009065762 in words is "twenty-one billion, nine million, sixty-five thousand, seven hundred sixty-two".