781010221201 has 4 divisors (see below), whose sum is σ = 892583109952. Its totient is φ = 669437332452.

The previous prime is 781010221163. The next prime is 781010221207. The reversal of 781010221201 is 102122010187.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 781010221201 - 2¹⁹ = 781009696913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781010221207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55786444365 + ... + 55786444378.

It is an arithmetic number, because the mean of its divisors is an integer number (223145777488).

Almost surely, 2^781010221201 is an apocalyptic number.

It is an amenable number.

781010221201 is a deficient number, since it is larger than the sum of its proper divisors (111572888751).

781010221201 is a wasteful number, since it uses less digits than its factorization.

781010221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111572888750.

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 781010221201 its reverse (102122010187), we get a palindrome (883132231388).

The spelling of 781010221201 in words is "seven hundred eighty-one billion, ten million, two hundred twenty-one thousand, two hundred one".