20201102020091 has 4 divisors (see below), whose sum is σ = 20852750472384. Its totient is φ = 19549453567800.

The previous prime is 20201102020079. The next prime is 20201102020103. The reversal of 20201102020091 is 19002020110202.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (20201102020079) and next prime (20201102020103).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201102020091 is a prime.

It is a super-2 number, since 2×20201102020091² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201102020591) 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, 325824226100 + ... + 325824226161.

It is an arithmetic number, because the mean of its divisors is an integer number (5213187618096).

Almost surely, 2^{20201102020091} is an apocalyptic number.

20201102020091 is a deficient number, since it is larger than the sum of its proper divisors (651648452293).

20201102020091 is an equidigital number, since it uses as much as digits as its factorization.

20201102020091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651648452292.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20201102020091 its reverse (19002020110202), we get a palindrome (39203122130293).

The spelling of 20201102020091 in words is "twenty trillion, two hundred one billion, one hundred two million, twenty thousand, ninety-one".