20022111091 has 4 divisors (see below), whose sum is σ = 20033613184. Its totient is φ = 20010609000.

The previous prime is 20022111071. The next prime is 20022111101. The reversal of 20022111091 is 19011122002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19011122002 = 2 ⋅9505561001.

It is a cyclic number.

It is not a de Polignac number, because 20022111091 - 2¹⁷ = 20021980019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20022111071) 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, 5748435 + ... + 5751916.

It is an arithmetic number, because the mean of its divisors is an integer number (5008403296).

Almost surely, 2^20022111091 is an apocalyptic number.

20022111091 is a deficient number, since it is larger than the sum of its proper divisors (11502093).

20022111091 is a wasteful number, since it uses less digits than its factorization.

20022111091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11502092.

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

Adding to 20022111091 its reverse (19011122002), we get a palindrome (39033233093).

The spelling of 20022111091 in words is "twenty billion, twenty-two million, one hundred eleven thousand, ninety-one".