1221002023 has 2 divisors, whose sum is σ = 1221002024. Its totient is φ = 1221002022.

The previous prime is 1221002021. The next prime is 1221002039. The reversal of 1221002023 is 3202001221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221002023 - 2¹ = 1221002021 is a prime.

Together with 1221002021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1221001994 and 1221002012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221002021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501011 + 610501012.

It is an arithmetic number, because the mean of its divisors is an integer number (610501012).

Almost surely, 2^1221002023 is an apocalyptic number.

1221002023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002023 is an equidigital number, since it uses as much as digits as its factorization.

1221002023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221002023 is about 34942.8393665998. The cubic root of 1221002023 is about 1068.8221887197.

Adding to 1221002023 its reverse (3202001221), we get a palindrome (4423003244).

The spelling of 1221002023 in words is "one billion, two hundred twenty-one million, two thousand, twenty-three".