2121222212 has 6 divisors (see below), whose sum is σ = 3712138878. Its totient is φ = 1060611104.

The previous prime is 2121222193. The next prime is 2121222227. The reversal of 2121222212 is 2122221212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1191216196 + 930006016 = 34514^2 + 30496^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265152773 + ... + 265152780.

It is an arithmetic number, because the mean of its divisors is an integer number (618689813).

Almost surely, 2^2121222212 is an apocalyptic number.

It is an amenable number.

2121222212 is a deficient number, since it is larger than the sum of its proper divisors (1590916666).

2121222212 is a wasteful number, since it uses less digits than its factorization.

2121222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530305557 (or 530305555 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 2121222212 is about 46056.7281946949. The cubic root of 2121222212 is about 1284.8784801334.

Adding to 2121222212 its reverse (2122221212), we get a palindrome (4243443424).

The spelling of 2121222212 in words is "two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".