781221011201101 has 16 divisors (see below), whose sum is σ = 818468588502144. Its totient is φ = 744251798816064.

The previous prime is 781221011201089. The next prime is 781221011201123. The reversal of 781221011201101 is 101102110122187.

It is not a de Polignac number, because 781221011201101 - 2⁵ = 781221011201069 is a prime.

It is a super-2 number, since 2×781221011201101² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 781221011201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781221011201131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48807450 + ... + 62806123.

It is an arithmetic number, because the mean of its divisors is an integer number (51154286781384).

Almost surely, 2^{781221011201101} is an apocalyptic number.

It is an amenable number.

781221011201101 is a deficient number, since it is larger than the sum of its proper divisors (37247577301043).

781221011201101 is a wasteful number, since it uses less digits than its factorization.

781221011201101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111614820.

The product of its (nonzero) digits is 448, while the sum is 28.

Adding to 781221011201101 its reverse (101102110122187), we get a palindrome (882323121323288).

The spelling of 781221011201101 in words is "seven hundred eighty-one trillion, two hundred twenty-one billion, eleven million, two hundred one thousand, one hundred one".