1221863023 has 2 divisors, whose sum is σ = 1221863024. Its totient is φ = 1221863022.

The previous prime is 1221862997. The next prime is 1221863051. The reversal of 1221863023 is 3203681221.

It is an a-pointer prime, because the next prime (1221863051) can be obtained adding 1221863023 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221863023 - 2⁵ = 1221862991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221862982 and 1221863000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221863053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610931511 + 610931512.

It is an arithmetic number, because the mean of its divisors is an integer number (610931512).

Almost surely, 2^1221863023 is an apocalyptic number.

1221863023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221863023 is an equidigital number, since it uses as much as digits as its factorization.

1221863023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1221863023 is about 34955.1573161958. The cubic root of 1221863023 is about 1069.0733593874.

The spelling of 1221863023 in words is "one billion, two hundred twenty-one million, eight hundred sixty-three thousand, twenty-three".