1211203123042 has 16 divisors (see below), whose sum is σ = 2019364385472. Its totient is φ = 540159196720.

The previous prime is 1211203123021. The next prime is 1211203123043. The reversal of 1211203123042 is 2403213021121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1211203123043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519382678 + ... + 519385009.

It is an arithmetic number, because the mean of its divisors is an integer number (126210274092).

Almost surely, 2^{1211203123042} is an apocalyptic number.

1211203123042 is a deficient number, since it is larger than the sum of its proper divisors (808161262430).

1211203123042 is a wasteful number, since it uses less digits than its factorization.

1211203123042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038767753.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1211203123042 its reverse (2403213021121), we get a palindrome (3614416144163).

The spelling of 1211203123042 in words is "one trillion, two hundred eleven billion, two hundred three million, one hundred twenty-three thousand, forty-two".