191411020021 has 8 divisors (see below), whose sum is σ = 206138556344. Its totient is φ = 176683999680.

The previous prime is 191411020019. The next prime is 191411020037. The reversal of 191411020021 is 120020114191.

191411020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 485717521 + 190925302500 = 22039^2 + 436950^2 .

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 191411020021 - 2¹ = 191411020019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191411019974 and 191411020001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191411020001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1021711 + ... + 1194451.

It is an arithmetic number, because the mean of its divisors is an integer number (25767319543).

Almost surely, 2^191411020021 is an apocalyptic number.

It is an amenable number.

191411020021 is a deficient number, since it is larger than the sum of its proper divisors (14727536323).

191411020021 is a wasteful number, since it uses less digits than its factorization.

191411020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257991.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 191411020021 in words is "one hundred ninety-one billion, four hundred eleven million, twenty thousand, twenty-one".