1221222823 has 2 divisors, whose sum is σ = 1221222824. Its totient is φ = 1221222822.

The previous prime is 1221222817. The next prime is 1221222839. The reversal of 1221222823 is 3282221221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221222823 - 2²⁹ = 684351911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221222883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611411 + 610611412.

It is an arithmetic number, because the mean of its divisors is an integer number (610611412).

Almost surely, 2^1221222823 is an apocalyptic number.

1221222823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222823 is an equidigital number, since it uses as much as digits as its factorization.

1221222823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 25.

The square root of 1221222823 is about 34945.9986693756. The cubic root of 1221222823 is about 1068.8866116856.

The spelling of 1221222823 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, eight hundred twenty-three".