1221001102 has 4 divisors (see below), whose sum is σ = 1831501656. Its totient is φ = 610500550.

The previous prime is 1221001097. The next prime is 1221001127. The reversal of 1221001102 is 2011001221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2011001221 = 3823 ⋅526027.

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, 305250274 + ... + 305250277.

It is an arithmetic number, because the mean of its divisors is an integer number (457875414).

Almost surely, 2^1221001102 is an apocalyptic number.

1221001102 is a deficient number, since it is larger than the sum of its proper divisors (610500554).

1221001102 is an equidigital number, since it uses as much as digits as its factorization.

1221001102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610500553.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1221001102 is about 34942.8261879316. The cubic root of 1221001102 is about 1068.8219199826.

Adding to 1221001102 its reverse (2011001221), we get a palindrome (3232002323).

The spelling of 1221001102 in words is "one billion, two hundred twenty-one million, one thousand, one hundred two".