764210721221 has 8 divisors (see below), whose sum is σ = 773727286080. Its totient is φ = 754701518592.

The previous prime is 764210721193. The next prime is 764210721223. The reversal of 764210721221 is 122127012467.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 764210721221 - 2²² = 764206526917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764210721223) by changing a digit.

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, 1631516 + ... + 2047013.

It is an arithmetic number, because the mean of its divisors is an integer number (96715910760).

Almost surely, 2^764210721221 is an apocalyptic number.

It is an amenable number.

764210721221 is a deficient number, since it is larger than the sum of its proper divisors (9516564859).

764210721221 is a wasteful number, since it uses less digits than its factorization.

764210721221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681115.

The product of its (nonzero) digits is 18816, while the sum is 35.

Adding to 764210721221 its reverse (122127012467), we get a palindrome (886337733688).

The spelling of 764210721221 in words is "seven hundred sixty-four billion, two hundred ten million, seven hundred twenty-one thousand, two hundred twenty-one".