771912121021 has 8 divisors (see below), whose sum is σ = 778770881280. Its totient is φ = 765053846592.

The previous prime is 771912120983. The next prime is 771912121033. The reversal of 771912121021 is 120121219177.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771912121021 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 (771912181021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3564966 + ... + 3775288.

It is an arithmetic number, because the mean of its divisors is an integer number (97346360160).

Almost surely, 2^771912121021 is an apocalyptic number.

It is an amenable number.

771912121021 is a deficient number, since it is larger than the sum of its proper divisors (6858760259).

771912121021 is a wasteful number, since it uses less digits than its factorization.

771912121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242915.

The product of its (nonzero) digits is 3528, while the sum is 34.

The spelling of 771912121021 in words is "seven hundred seventy-one billion, nine hundred twelve million, one hundred twenty-one thousand, twenty-one".