1211203020142 has 4 divisors (see below), whose sum is σ = 1816804530216. Its totient is φ = 605601510070.

The previous prime is 1211203020119. The next prime is 1211203020149. The reversal of 1211203020142 is 2410203021121.

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

It is a super-2 number, since 2×1211203020142² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211203020149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302800755034 + ... + 302800755037.

It is an arithmetic number, because the mean of its divisors is an integer number (454201132554).

Almost surely, 2^{1211203020142} is an apocalyptic number.

1211203020142 is a deficient number, since it is larger than the sum of its proper divisors (605601510074).

1211203020142 is an equidigital number, since it uses as much as digits as its factorization.

1211203020142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605601510073.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1211203020142 its reverse (2410203021121), we get a palindrome (3621406041263).

The spelling of 1211203020142 in words is "one trillion, two hundred eleven billion, two hundred three million, twenty thousand, one hundred forty-two".