1220213123 has 2 divisors, whose sum is σ = 1220213124. Its totient is φ = 1220213122.

The previous prime is 1220213119. The next prime is 1220213147. The reversal of 1220213123 is 3213120221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220213123 - 2² = 1220213119 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220213153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610106561 + 610106562.

It is an arithmetic number, because the mean of its divisors is an integer number (610106562).

Almost surely, 2^1220213123 is an apocalyptic number.

1220213123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220213123 is an equidigital number, since it uses as much as digits as its factorization.

1220213123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1220213123 is about 34931.5491067888. The cubic root of 1220213123 is about 1068.5919473626.

Adding to 1220213123 its reverse (3213120221), we get a palindrome (4433333344).

The spelling of 1220213123 in words is "one billion, two hundred twenty million, two hundred thirteen thousand, one hundred twenty-three".