1221220001002 has 8 divisors (see below), whose sum is σ = 1831953095136. Its totient is φ = 610568969292.

The previous prime is 1221220000981. The next prime is 1221220001107. The reversal of 1221220001002 is 2001000221221.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 20478388 + ... + 20537935.

It is an arithmetic number, because the mean of its divisors is an integer number (228994136892).

Almost surely, 2^{1221220001002} is an apocalyptic number.

1221220001002 is a deficient number, since it is larger than the sum of its proper divisors (610733094134).

1221220001002 is a wasteful number, since it uses less digits than its factorization.

1221220001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41031212.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221220001002 its reverse (2001000221221), we get a palindrome (3222220222223).

The spelling of 1221220001002 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one thousand, two".