1221010220002 has 4 divisors (see below), whose sum is σ = 1831515330006. Its totient is φ = 610505110000.

The previous prime is 1221010219921. The next prime is 1221010220063. The reversal of 1221010220002 is 2000220101221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1216809754281 + 4200465721 = 1103091^2 + 64811^2 .

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 as a sum of consecutive naturals, namely, 305252554999 + ... + 305252555002.

Almost surely, 2^{1221010220002} is an apocalyptic number.

1221010220002 is a deficient number, since it is larger than the sum of its proper divisors (610505110004).

1221010220002 is an equidigital number, since it uses as much as digits as its factorization.

1221010220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610505110003.

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

Adding to 1221010220002 its reverse (2000220101221), we get a palindrome (3221230321223).

The spelling of 1221010220002 in words is "one trillion, two hundred twenty-one billion, ten million, two hundred twenty thousand, two".