20122111001 has 4 divisors (see below), whose sum is σ = 20122410000. Its totient is φ = 20121812004.

The previous prime is 20122110997. The next prime is 20122111127. The reversal of 20122111001 is 10011122102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20122111001 - 2² = 20122110997 is a prime.

It is a super-2 number, since 2×20122111001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20122111301) 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, 3950 + ... + 200648.

It is an arithmetic number, because the mean of its divisors is an integer number (5030602500).

Almost surely, 2^20122111001 is an apocalyptic number.

It is an amenable number.

20122111001 is a deficient number, since it is larger than the sum of its proper divisors (298999).

20122111001 is a wasteful number, since it uses less digits than its factorization.

20122111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298998.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20122111001 its reverse (10011122102), we get a palindrome (30133233103).

The spelling of 20122111001 in words is "twenty billion, one hundred twenty-two million, one hundred eleven thousand, one".