1221011001002 has 16 divisors (see below), whose sum is σ = 2020509763272. Its totient is φ = 549798574080.

The previous prime is 1221011000987. The next prime is 1221011001011. The reversal of 1221011001002 is 2001001101221.

It can be written as a sum of positive squares in 4 ways, for example, as 168419131321 + 1052591869681 = 410389^2 + 1025959^2 .

It is a super-3 number, since 3×1221011001002³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572705783 + ... + 572707914.

Almost surely, 2^{1221011001002} is an apocalyptic number.

1221011001002 is a deficient number, since it is larger than the sum of its proper divisors (799498762270).

1221011001002 is a wasteful number, since it uses less digits than its factorization.

1221011001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145413753.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221011001002 its reverse (2001001101221), we get a palindrome (3222012102223).

The spelling of 1221011001002 in words is "one trillion, two hundred twenty-one billion, eleven million, one thousand, two".