1221202221222 has 32 divisors (see below), whose sum is σ = 2446481208960. Its totient is φ = 406388505600.

The previous prime is 1221202221203. The next prime is 1221202221263. The reversal of 1221202221222 is 2221222021221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8816433 + ... + 8953875.

It is an arithmetic number, because the mean of its divisors is an integer number (76452537780).

Almost surely, 2^{1221202221222} is an apocalyptic number.

1221202221222 is an abundant number, since it is smaller than the sum of its proper divisors (1225278987738).

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

1221202221222 is a wasteful number, since it uses less digits than its factorization.

1221202221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139908.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 1221202221222 its reverse (2221222021221), we get a palindrome (3442424242443).

The spelling of 1221202221222 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty-two".