20101212222 has 128 divisors (see below), whose sum is σ = 53492812800. Its totient is φ = 4886562816.

The previous prime is 20101212211. The next prime is 20101212223. The reversal of 20101212222 is 22221210102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101212223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 357654 + ... + 410022.

It is an arithmetic number, because the mean of its divisors is an integer number (417912600).

Almost surely, 2^20101212222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20101212222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26746406400).

20101212222 is an abundant number, since it is smaller than the sum of its proper divisors (33391600578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20101212222 is a wasteful number, since it uses less digits than its factorization.

20101212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52450.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20101212222 its reverse (22221210102), we get a palindrome (42322422324).

The spelling of 20101212222 in words is "twenty billion, one hundred one million, two hundred twelve thousand, two hundred twenty-two".