1231220201122 has 4 divisors (see below), whose sum is σ = 1846830301686. Its totient is φ = 615610100560.

The previous prime is 1231220201069. The next prime is 1231220201129. The reversal of 1231220201122 is 2211020221321.

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., 653104806201 + 578115394921 = 808149^2 + 760339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1231220201122.

It is not an unprimeable number, because it can be changed into a prime (1231220201129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307805050279 + ... + 307805050282.

Almost surely, 2^{1231220201122} is an apocalyptic number.

1231220201122 is a deficient number, since it is larger than the sum of its proper divisors (615610100564).

1231220201122 is an equidigital number, since it uses as much as digits as its factorization.

1231220201122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615610100563.

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

Adding to 1231220201122 its reverse (2211020221321), we get a palindrome (3442240422443).

The spelling of 1231220201122 in words is "one trillion, two hundred thirty-one billion, two hundred twenty million, two hundred one thousand, one hundred twenty-two".