491002022021111 has 4 divisors (see below), whose sum is σ = 491444765053800. Its totient is φ = 490559278988424.

The previous prime is 491002022021089. The next prime is 491002022021123. The reversal of 491002022021111 is 111120220200194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491002022021111 - 2¹⁸ = 491002021758967 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 (491002022021131) 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, 221371514681 + ... + 221371516898.

It is an arithmetic number, because the mean of its divisors is an integer number (122861191263450).

Almost surely, 2^{491002022021111} is an apocalyptic number.

491002022021111 is a deficient number, since it is larger than the sum of its proper divisors (442743032689).

491002022021111 is a wasteful number, since it uses less digits than its factorization.

491002022021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442743032688.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 491002022021111 in words is "four hundred ninety-one trillion, two billion, twenty-two million, twenty-one thousand, one hundred eleven".