1221012220019 has 4 divisors (see below), whose sum is σ = 1232866707696. Its totient is φ = 1209157732344.

The previous prime is 1221012220009. The next prime is 1221012220061. The reversal of 1221012220019 is 9100222101221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221012220019 - 2⁴⁰ = 121500592243 is a prime.

It is a super-2 number, since 2×1221012220019² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221012219976 and 1221012220003.

It is not an unprimeable number, because it can be changed into a prime (1221012220009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5927243684 + ... + 5927243889.

It is an arithmetic number, because the mean of its divisors is an integer number (308216676924).

Almost surely, 2^{1221012220019} is an apocalyptic number.

1221012220019 is a deficient number, since it is larger than the sum of its proper divisors (11854487677).

1221012220019 is a wasteful number, since it uses less digits than its factorization.

1221012220019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11854487676.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1221012220019 in words is "one trillion, two hundred twenty-one billion, twelve million, two hundred twenty thousand, nineteen".