1221011102 has 4 divisors (see below), whose sum is σ = 1831516656. Its totient is φ = 610505550.

The previous prime is 1221011093. The next prime is 1221011107. The reversal of 1221011102 is 2011101221.

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

It is a super-2 number, since 2×1221011102² = 2981736222414508808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305252774 + ... + 305252777.

It is an arithmetic number, because the mean of its divisors is an integer number (457879164).

Almost surely, 2^1221011102 is an apocalyptic number.

1221011102 is a deficient number, since it is larger than the sum of its proper divisors (610505554).

1221011102 is an equidigital number, since it uses as much as digits as its factorization.

1221011102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610505553.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1221011102 is about 34942.9692785258. The cubic root of 1221011102 is about 1068.8248378588.

Adding to 1221011102 its reverse (2011101221), we get a palindrome (3232112323).

The spelling of 1221011102 in words is "one billion, two hundred twenty-one million, eleven thousand, one hundred two".