191201421010001 has 4 divisors (see below), whose sum is σ = 202448563422372. Its totient is φ = 179954278597632.

The previous prime is 191201421009961. The next prime is 191201421010081. The reversal of 191201421010001 is 100010124102191.

191201421010001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 177320543262976 + 13880877747025 = 13316176^2 + 3725705^2 .

It is a cyclic number.

It is not a de Polignac number, because 191201421010001 - 2²² = 191201416815697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191201421010081) 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, 5623571206160 + ... + 5623571206193.

It is an arithmetic number, because the mean of its divisors is an integer number (50612140855593).

Almost surely, 2^{191201421010001} is an apocalyptic number.

It is an amenable number.

191201421010001 is a deficient number, since it is larger than the sum of its proper divisors (11247142412371).

191201421010001 is a wasteful number, since it uses less digits than its factorization.

191201421010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11247142412370.

The product of its (nonzero) digits is 144, while the sum is 23.

Adding to 191201421010001 its reverse (100010124102191), we get a palindrome (291211545112192).

The spelling of 191201421010001 in words is "one hundred ninety-one trillion, two hundred one billion, four hundred twenty-one million, ten thousand, one".