1223123200042 has 4 divisors (see below), whose sum is σ = 1834684800066. Its totient is φ = 611561600020.

The previous prime is 1223123199973. The next prime is 1223123200043. The reversal of 1223123200042 is 2400023213221.

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., 1178546900881 + 44576299161 = 1085609^2 + 211131^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1223123199986 and 1223123200022.

It is not an unprimeable number, because it can be changed into a prime (1223123200043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305780800009 + ... + 305780800012.

Almost surely, 2^{1223123200042} is an apocalyptic number.

1223123200042 is a deficient number, since it is larger than the sum of its proper divisors (611561600024).

1223123200042 is an equidigital number, since it uses as much as digits as its factorization.

1223123200042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611561600023.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 1223123200042 its reverse (2400023213221), we get a palindrome (3623146413263).

The spelling of 1223123200042 in words is "one trillion, two hundred twenty-three billion, one hundred twenty-three million, two hundred thousand, forty-two".