191550351221 has 4 divisors (see below), whose sum is σ = 192512916000. Its totient is φ = 190587786444.

The previous prime is 191550351199. The next prime is 191550351287. The reversal of 191550351221 is 122153055191.

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 a cyclic number.

It is not a de Polignac number, because 191550351221 - 2¹⁰ = 191550350197 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 (191550311221) 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, 481282091 + ... + 481282488.

It is an arithmetic number, because the mean of its divisors is an integer number (48128229000).

Almost surely, 2^191550351221 is an apocalyptic number.

It is an amenable number.

191550351221 is a deficient number, since it is larger than the sum of its proper divisors (962564779).

191550351221 is an equidigital number, since it uses as much as digits as its factorization.

191550351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962564778.

The product of its (nonzero) digits is 13500, while the sum is 35.

The spelling of 191550351221 in words is "one hundred ninety-one billion, five hundred fifty million, three hundred fifty-one thousand, two hundred twenty-one".