1210222212121 has 8 divisors (see below), whose sum is σ = 1303326672200. Its totient is φ = 1117119244032.

The previous prime is 1210222212109. The next prime is 1210222212149. The reversal of 1210222212121 is 1212122220121.

It can be written as a sum of positive squares in 4 ways, for example, as 125166656521 + 1085055555600 = 353789^2 + 1041660^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210222212121 - 2⁷ = 1210222211993 is a prime.

It is a super-2 number, since 2×1210222212121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210222212191) 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, 1766071 + ... + 2353603.

It is an arithmetic number, because the mean of its divisors is an integer number (162915834025).

Almost surely, 2^{1210222212121} is an apocalyptic number.

It is an amenable number.

1210222212121 is a deficient number, since it is larger than the sum of its proper divisors (93104460079).

1210222212121 is a wasteful number, since it uses less digits than its factorization.

1210222212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745995.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1210222212121 its reverse (1212122220121), we get a palindrome (2422344432242).

The spelling of 1210222212121 in words is "one trillion, two hundred ten billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".