20101010220091 has 16 divisors (see below), whose sum is σ = 20320801855200. Its totient is φ = 19881869914368.

The previous prime is 20101010220059. The next prime is 20101010220101. The reversal of 20101010220091 is 19002201010102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20101010220091 - 2⁵ = 20101010220059 is a prime.

It is a super-2 number, since 2×20101010220091² (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 (20101010220491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 814354236 + ... + 814378918.

It is an arithmetic number, because the mean of its divisors is an integer number (1270050115950).

Almost surely, 2^{20101010220091} is an apocalyptic number.

20101010220091 is a deficient number, since it is larger than the sum of its proper divisors (219791635109).

20101010220091 is a wasteful number, since it uses less digits than its factorization.

20101010220091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37518.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 20101010220091 its reverse (19002201010102), we get a palindrome (39103211230193).

The spelling of 20101010220091 in words is "twenty trillion, one hundred one billion, ten million, two hundred twenty thousand, ninety-one".