1221010001002 has 64 divisors (see below), whose sum is σ = 2190031084800. Its totient is φ = 503991290880.

The previous prime is 1221010000967. The next prime is 1221010001021. The reversal of 1221010001002 is 2001000101221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221010001002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15720499 + ... + 15797977.

It is an arithmetic number, because the mean of its divisors is an integer number (34219235700).

Almost surely, 2^{1221010001002} is an apocalyptic number.

1221010001002 is a deficient number, since it is larger than the sum of its proper divisors (969021083798).

1221010001002 is a wasteful number, since it uses less digits than its factorization.

1221010001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78991.

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

Adding to 1221010001002 its reverse (2001000101221), we get a palindrome (3222010102223).

The spelling of 1221010001002 in words is "one trillion, two hundred twenty-one billion, ten million, one thousand, two".