1221101131123 has 4 divisors (see below), whose sum is σ = 1221103366600. Its totient is φ = 1221098895648.

The previous prime is 1221101131067. The next prime is 1221101131147. The reversal of 1221101131123 is 3211311011221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221101131123 - 2⁹ = 1221101130611 is a prime.

It is a super-2 number, since 2×1221101131123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221101131123.

It is not an unprimeable number, because it can be changed into a prime (1221101131163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306811 + ... + 1592587.

It is an arithmetic number, because the mean of its divisors is an integer number (305275841650).

Almost surely, 2^{1221101131123} is an apocalyptic number.

1221101131123 is a deficient number, since it is larger than the sum of its proper divisors (2235477).

1221101131123 is an equidigital number, since it uses as much as digits as its factorization.

1221101131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235476.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1221101131123 its reverse (3211311011221), we get a palindrome (4432412142344).

The spelling of 1221101131123 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred thirty-one thousand, one hundred twenty-three".