1221110002 has 16 divisors (see below), whose sum is σ = 2093846400. Its totient is φ = 523204128.

The previous prime is 1221109973. The next prime is 1221110071. The reversal of 1221110002 is 2000111221.

It is a super-2 number, since 2×1221110002² = 2982219273968880008, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68283 + ... + 84289.

It is an arithmetic number, because the mean of its divisors is an integer number (130865400).

Almost surely, 2^1221110002 is an apocalyptic number.

1221110002 is a deficient number, since it is larger than the sum of its proper divisors (872736398).

1221110002 is a wasteful number, since it uses less digits than its factorization.

1221110002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21465.

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

The square root of 1221110002 is about 34944.3844129497. The cubic root of 1221110002 is about 1068.8536947961.

Adding to 1221110002 its reverse (2000111221), we get a palindrome (3221221223).

The spelling of 1221110002 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, two".