1221220021102 has 4 divisors (see below), whose sum is σ = 1831830031656. Its totient is φ = 610610010550.

The previous prime is 1221220021097. The next prime is 1221220021117. The reversal of 1221220021102 is 2011200221221.

It is a happy number.

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, 305305005274 + ... + 305305005277.

It is an arithmetic number, because the mean of its divisors is an integer number (457957507914).

Almost surely, 2^{1221220021102} is an apocalyptic number.

1221220021102 is a deficient number, since it is larger than the sum of its proper divisors (610610010554).

1221220021102 is an equidigital number, since it uses as much as digits as its factorization.

1221220021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610610010553.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221220021102 its reverse (2011200221221), we get a palindrome (3232420242323).

The spelling of 1221220021102 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, twenty-one thousand, one hundred two".