1221221110102 has 48 divisors (see below), whose sum is σ = 2142202636800. Its totient is φ = 520607379600.

The previous prime is 1221221110063. The next prime is 1221221110157. The reversal of 1221221110102 is 2010111221221.

It is a super-2 number, since 2×1221221110102² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102008977 + ... + 102020947.

It is an arithmetic number, because the mean of its divisors is an integer number (44629221600).

Almost surely, 2^{1221221110102} is an apocalyptic number.

1221221110102 is a deficient number, since it is larger than the sum of its proper divisors (920981526698).

1221221110102 is a wasteful number, since it uses less digits than its factorization.

1221221110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17417 (or 17410 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221221110102 its reverse (2010111221221), we get a palindrome (3231332331323).

The spelling of 1221221110102 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, one hundred two".