1221011002 has 8 divisors (see below), whose sum is σ = 1840197312. Its totient is φ = 607611900.

The previous prime is 1221010997. The next prime is 1221011021. The reversal of 1221011002 is 2001101221.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1221011002.

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, 1446274 + ... + 1447117.

It is an arithmetic number, because the mean of its divisors is an integer number (230024664).

Almost surely, 2^1221011002 is an apocalyptic number.

1221011002 is a deficient number, since it is larger than the sum of its proper divisors (619186310).

1221011002 is a wasteful number, since it uses less digits than its factorization.

1221011002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893604.

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

The square root of 1221011002 is about 34942.9678476228. The cubic root of 1221011002 is about 1068.8248086801.

Adding to 1221011002 its reverse (2001101221), we get a palindrome (3222112223).

The spelling of 1221011002 in words is "one billion, two hundred twenty-one million, eleven thousand, two".