1221211212022 has 4 divisors (see below), whose sum is σ = 1831816818036. Its totient is φ = 610605606010.

The previous prime is 1221211211959. The next prime is 1221211212187. The reversal of 1221211212022 is 2202121121221.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305302803004 + ... + 305302803007.

It is an arithmetic number, because the mean of its divisors is an integer number (457954204509).

Almost surely, 2^{1221211212022} is an apocalyptic number.

1221211212022 is a deficient number, since it is larger than the sum of its proper divisors (610605606014).

1221211212022 is an equidigital number, since it uses as much as digits as its factorization.

1221211212022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610605606013.

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

Adding to 1221211212022 its reverse (2202121121221), we get a palindrome (3423332333243).

The spelling of 1221211212022 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, twenty-two".