491001220102101 has 8 divisors (see below), whose sum is σ = 655689616862784. Its totient is φ = 326823485038080.

The previous prime is 491001220102097. The next prime is 491001220102201. The reversal of 491001220102101 is 101201022100194.

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

It is not a de Polignac number, because 491001220102101 - 2² = 491001220102097 is a prime.

It is a super-2 number, since 2×491001220102101² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491001220102201) 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, 127665421921 + ... + 127665425766.

It is an arithmetic number, because the mean of its divisors is an integer number (81961202107848).

Almost surely, 2^{491001220102101} is an apocalyptic number.

It is an amenable number.

491001220102101 is a deficient number, since it is larger than the sum of its proper divisors (164688396760683).

491001220102101 is a wasteful number, since it uses less digits than its factorization.

491001220102101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255330848331.

The product of its (nonzero) digits is 288, while the sum is 24.

Adding to 491001220102101 its reverse (101201022100194), we get a palindrome (592202242202295).

The spelling of 491001220102101 in words is "four hundred ninety-one trillion, one billion, two hundred twenty million, one hundred two thousand, one hundred one".