20111222201 has 16 divisors (see below), whose sum is σ = 24221554560. Its totient is φ = 16312285440.

The previous prime is 20111222191. The next prime is 20111222203. The reversal of 20111222201 is 10222211102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111222201 is a prime.

It is a super-2 number, since 2×20111222201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20111222203) 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, 31355 + ... + 202991.

It is an arithmetic number, because the mean of its divisors is an integer number (1513847160).

Almost surely, 2^20111222201 is an apocalyptic number.

It is an amenable number.

20111222201 is a deficient number, since it is larger than the sum of its proper divisors (4110332359).

20111222201 is a wasteful number, since it uses less digits than its factorization.

20111222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172544.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20111222201 its reverse (10222211102), we get a palindrome (30333433303).

The spelling of 20111222201 in words is "twenty billion, one hundred eleven million, two hundred twenty-two thousand, two hundred one".