1221221001102 has 16 divisors (see below), whose sum is σ = 2521230454272. Its totient is φ = 393942258360.

The previous prime is 1221221001101. The next prime is 1221221001131. The reversal of 1221221001102 is 2011001221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221001101) 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, 3282851968 + ... + 3282852339.

It is an arithmetic number, because the mean of its divisors is an integer number (157576903392).

Almost surely, 2^{1221221001102} is an apocalyptic number.

1221221001102 is an abundant number, since it is smaller than the sum of its proper divisors (1300009453170).

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

1221221001102 is a wasteful number, since it uses less digits than its factorization.

1221221001102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6565704343.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221221001102 its reverse (2011001221221), we get a palindrome (3232222222323).

The spelling of 1221221001102 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one thousand, one hundred two".