1220021312123 has 2 divisors, whose sum is σ = 1220021312124. Its totient is φ = 1220021312122.

The previous prime is 1220021312101. The next prime is 1220021312161. The reversal of 1220021312123 is 3212131200221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220021312123 - 2²² = 1220017117819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220021312095 and 1220021312104.

It is not a weakly prime, because it can be changed into another prime (1220021312183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610010656061 + 610010656062.

It is an arithmetic number, because the mean of its divisors is an integer number (610010656062).

Almost surely, 2^{1220021312123} is an apocalyptic number.

1220021312123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220021312123 is an equidigital number, since it uses as much as digits as its factorization.

1220021312123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1220021312123 its reverse (3212131200221), we get a palindrome (4432152512344).

The spelling of 1220021312123 in words is "one trillion, two hundred twenty billion, twenty-one million, three hundred twelve thousand, one hundred twenty-three".