20121222 has 16 divisors (see below), whose sum is σ = 43900992. Its totient is φ = 6097320.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121222 is 22212102.

It is a junction number, because it is equal to n+sod(n) for n = 20121198 and 20121207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152368 + ... + 152499.

It is an arithmetic number, because the mean of its divisors is an integer number (2743812).

Almost surely, 2^20121222 is an apocalyptic number.

20121222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20121222 is an abundant number, since it is smaller than the sum of its proper divisors (23779770).

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

20121222 is a wasteful number, since it uses less digits than its factorization.

20121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304883.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20121222 is about 4485.6685120503. The cubic root of 20121222 is about 271.9890692695.

Adding to 20121222 its reverse (22212102), we get a palindrome (42333324).

The spelling of 20121222 in words is "twenty million, one hundred twenty-one thousand, two hundred twenty-two".