788772721221 has 12 divisors (see below), whose sum is σ = 1139365619340. Its totient is φ = 525835906560.

The previous prime is 788772721213. The next prime is 788772721229. The reversal of 788772721221 is 122127277887.

788772721221 is a `hidden beast` number, since 7 + 88 + 77 + 272 + 1 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (788772721213) and next prime (788772721229).

It can be written as a sum of positive squares in 2 ways, for example, as 362867688225 + 425905032996 = 602385^2 + 652614^2 .

It is not a de Polignac number, because 788772721221 - 2³ = 788772721213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (788772721229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 642310 + ... + 1410711.

It is an arithmetic number, because the mean of its divisors is an integer number (94947134945).

Almost surely, 2^788772721221 is an apocalyptic number.

It is an amenable number.

788772721221 is a deficient number, since it is larger than the sum of its proper divisors (350592898119).

788772721221 is a wasteful number, since it uses less digits than its factorization.

788772721221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095716 (or 2095713 counting only the distinct ones).

The product of its digits is 2458624, while the sum is 54.

The spelling of 788772721221 in words is "seven hundred eighty-eight billion, seven hundred seventy-two million, seven hundred twenty-one thousand, two hundred twenty-one".