1221000002 has 8 divisors (see below), whose sum is σ = 1927894800. Its totient is φ = 578368404.

The previous prime is 1220999999. The next prime is 1221000017. The reversal of 1221000002 is 2000001221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16065752 + ... + 16065827.

It is an arithmetic number, because the mean of its divisors is an integer number (240986850).

Almost surely, 2^1221000002 is an apocalyptic number.

1221000002 is a deficient number, since it is larger than the sum of its proper divisors (706894798).

1221000002 is a wasteful number, since it uses less digits than its factorization.

1221000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32131600.

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

The square root of 1221000002 is about 34942.8104479305. The cubic root of 1221000002 is about 1068.8215990152.

Adding to 1221000002 its reverse (2000001221), we get a palindrome (3221001223).

The spelling of 1221000002 in words is "one billion, two hundred twenty-one million, two", and thus it is an aban number.