1221001011023 has 2 divisors, whose sum is σ = 1221001011024. Its totient is φ = 1221001011022.

The previous prime is 1221001010969. The next prime is 1221001011067. The reversal of 1221001011023 is 3201101001221.

It is a strong prime.

It is an emirp because it is prime and its reverse (3201101001221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221001011023 - 2²² = 1220996816719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221001010989 and 1221001011007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221001017023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500505511 + 610500505512.

It is an arithmetic number, because the mean of its divisors is an integer number (610500505512).

Almost surely, 2^{1221001011023} is an apocalyptic number.

1221001011023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221001011023 is an equidigital number, since it uses as much as digits as its factorization.

1221001011023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1221001011023 its reverse (3201101001221), we get a palindrome (4422102012244).

The spelling of 1221001011023 in words is "one trillion, two hundred twenty-one billion, one million, eleven thousand, twenty-three".