291413421221 has 4 divisors (see below), whose sum is σ = 313829838252. Its totient is φ = 268997004192.

The previous prime is 291413421197. The next prime is 291413421301. The reversal of 291413421221 is 122124314192.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126370296196 + 165043125025 = 355486^2 + 406255^2 .

It is a cyclic number.

It is not a de Polignac number, because 291413421221 - 2¹⁸ = 291413159077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291413421121) 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, 11208208496 + ... + 11208208521.

It is an arithmetic number, because the mean of its divisors is an integer number (78457459563).

Almost surely, 2^291413421221 is an apocalyptic number.

It is an amenable number.

291413421221 is a deficient number, since it is larger than the sum of its proper divisors (22416417031).

291413421221 is a wasteful number, since it uses less digits than its factorization.

291413421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22416417030.

The product of its digits is 6912, while the sum is 32.

The spelling of 291413421221 in words is "two hundred ninety-one billion, four hundred thirteen million, four hundred twenty-one thousand, two hundred twenty-one".