20101222 has 16 divisors (see below), whose sum is σ = 30668544. Its totient is φ = 9880000.

The previous prime is 20101219. The next prime is 20101229. The reversal of 20101222 is 22210102.

It is a junction number, because it is equal to n+sod(n) for n = 20101199 and 20101208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38322 + ... + 38842.

It is an arithmetic number, because the mean of its divisors is an integer number (1916784).

Almost surely, 2^20101222 is an apocalyptic number.

20101222 is a deficient number, since it is larger than the sum of its proper divisors (10567322).

20101222 is a wasteful number, since it uses less digits than its factorization.

20101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20101222 is about 4483.4386356902. The cubic root of 20101222 is about 271.8989225790.

Adding to 20101222 its reverse (22210102), we get a palindrome (42311324).

The spelling of 20101222 in words is "twenty million, one hundred one thousand, two hundred twenty-two".