1221100102 has 4 divisors (see below), whose sum is σ = 1831650156. Its totient is φ = 610550050.

The previous prime is 1221100063. The next prime is 1221100121. The reversal of 1221100102 is 2010011221.

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, 305275024 + ... + 305275027.

It is an arithmetic number, because the mean of its divisors is an integer number (457912539).

Almost surely, 2^1221100102 is an apocalyptic number.

1221100102 is a deficient number, since it is larger than the sum of its proper divisors (610550054).

1221100102 is an equidigital number, since it uses as much as digits as its factorization.

1221100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610550053.

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

The square root of 1221100102 is about 34944.2427590011. The cubic root of 1221100102 is about 1068.8508062547.

Adding to 1221100102 its reverse (2010011221), we get a palindrome (3231111323).

The spelling of 1221100102 in words is "one billion, two hundred twenty-one million, one hundred thousand, one hundred two".