801320417721 has 6 divisors (see below), whose sum is σ = 1157462825610. Its totient is φ = 534213611808.

The previous prime is 801320417701. The next prime is 801320417761. The reversal of 801320417721 is 127714023108.

It can be written as a sum of positive squares in only one way, i.e., 801302474025 + 17943696 = 895155^2 + 4236^2 .

It is not a de Polignac number, because 801320417721 - 2¹⁹ = 801319893433 is a prime.

It is a super-2 number, since 2×801320417721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (801320417701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44517800976 + ... + 44517800993.

It is an arithmetic number, because the mean of its divisors is an integer number (192910470935).

Almost surely, 2^801320417721 is an apocalyptic number.

It is an amenable number.

801320417721 is a deficient number, since it is larger than the sum of its proper divisors (356142407889).

801320417721 is a wasteful number, since it uses less digits than its factorization.

801320417721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89035601975 (or 89035601972 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The spelling of 801320417721 in words is "eight hundred one billion, three hundred twenty million, four hundred seventeen thousand, seven hundred twenty-one".