1221102121222 has 4 divisors (see below), whose sum is σ = 1831653181836. Its totient is φ = 610551060610.

The previous prime is 1221102121219. The next prime is 1221102121229. The reversal of 1221102121222 is 2221212011221.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1221102121222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102121229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305275530304 + ... + 305275530307.

It is an arithmetic number, because the mean of its divisors is an integer number (457913295459).

Almost surely, 2^{1221102121222} is an apocalyptic number.

1221102121222 is a deficient number, since it is larger than the sum of its proper divisors (610551060614).

1221102121222 is an equidigital number, since it uses as much as digits as its factorization.

1221102121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610551060613.

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

Adding to 1221102121222 its reverse (2221212011221), we get a palindrome (3442314132443).

The spelling of 1221102121222 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty-two".