1221123023242 has 4 divisors (see below), whose sum is σ = 1831684534866. Its totient is φ = 610561511620.

The previous prime is 1221123023213. The next prime is 1221123023251. The reversal of 1221123023242 is 2423203211221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1218217705441 + 2905317801 = 1103729^2 + 53901^2 .

It is a super-2 number, since 2×1221123023242² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305280755809 + ... + 305280755812.

Almost surely, 2^{1221123023242} is an apocalyptic number.

1221123023242 is a deficient number, since it is larger than the sum of its proper divisors (610561511624).

1221123023242 is an equidigital number, since it uses as much as digits as its factorization.

1221123023242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610561511623.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1221123023242 its reverse (2423203211221), we get a palindrome (3644326234463).

The spelling of 1221123023242 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-three million, twenty-three thousand, two hundred forty-two".