191372421 has 8 divisors (see below), whose sum is σ = 263962080. Its totient is φ = 123182192.

The previous prime is 191372411. The next prime is 191372437. The reversal of 191372421 is 124273191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191372421 - 2¹⁴ = 191356037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191372411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099755 + ... + 1099928.

It is an arithmetic number, because the mean of its divisors is an integer number (32995260).

Almost surely, 2^191372421 is an apocalyptic number.

It is an amenable number.

191372421 is a deficient number, since it is larger than the sum of its proper divisors (72589659).

191372421 is a wasteful number, since it uses less digits than its factorization.

191372421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199715.

The product of its digits is 3024, while the sum is 30.

The square root of 191372421 is about 13833.7421184580. The cubic root of 191372421 is about 576.2705826268.

The spelling of 191372421 in words is "one hundred ninety-one million, three hundred seventy-two thousand, four hundred twenty-one".