1221021001113 has 4 divisors (see below), whose sum is σ = 1628028001488. Its totient is φ = 814014000740.

The previous prime is 1221021001093. The next prime is 1221021001129. The reversal of 1221021001113 is 3111001201221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221021001113 - 2⁹ = 1221021000601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221021001092 and 1221021001101.

It is not an unprimeable number, because it can be changed into a prime (1221021001183) by changing a digit.

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, 203503500183 + ... + 203503500188.

It is an arithmetic number, because the mean of its divisors is an integer number (407007000372).

Almost surely, 2^{1221021001113} is an apocalyptic number.

It is an amenable number.

1221021001113 is a deficient number, since it is larger than the sum of its proper divisors (407007000375).

1221021001113 is an equidigital number, since it uses as much as digits as its factorization.

1221021001113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407007000374.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1221021001113 its reverse (3111001201221), we get a palindrome (4332022202334).

The spelling of 1221021001113 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one thousand, one hundred thirteen".