1221111020002 has 4 divisors (see below), whose sum is σ = 1831666530006. Its totient is φ = 610555510000.

The previous prime is 1221111019967. The next prime is 1221111020021. The reversal of 1221111020002 is 2000201111221.

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., 1002443490841 + 218667529161 = 1001221^2 + 467619^2 .

It is a super-2 number, since 2×1221111020002² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305277754999 + ... + 305277755002.

Almost surely, 2^{1221111020002} is an apocalyptic number.

1221111020002 is a deficient number, since it is larger than the sum of its proper divisors (610555510004).

1221111020002 is an equidigital number, since it uses as much as digits as its factorization.

1221111020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610555510003.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221111020002 its reverse (2000201111221), we get a palindrome (3221312131223).

The spelling of 1221111020002 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty thousand, two".