77121001220312 has 24 divisors (see below), whose sum is σ = 168210347050260. Its totient is φ = 33051857665680.

The previous prime is 77121001220293. The next prime is 77121001220323. The reversal of 77121001220312 is 21302210012177.

It is a super-2 number, since 2×77121001220312² (a number of 29 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 98368623614 + ... + 98368624397.

Almost surely, 2^{77121001220312} is an apocalyptic number.

It is an amenable number.

77121001220312 is an abundant number, since it is smaller than the sum of its proper divisors (91089345829948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77121001220312 is a wasteful number, since it uses less digits than its factorization.

77121001220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196737248031 (or 196737248020 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

Adding to 77121001220312 its reverse (21302210012177), we get a palindrome (98423211232489).

The spelling of 77121001220312 in words is "seventy-seven trillion, one hundred twenty-one billion, one million, two hundred twenty thousand, three hundred twelve".