1213242542125 has 8 divisors (see below), whose sum is σ = 1514126692728. Its totient is φ = 970594033600.

The previous prime is 1213242542093. The next prime is 1213242542131. The reversal of 1213242542125 is 5212452423121.

It can be written as a sum of positive squares in 4 ways, for example, as 170105103844 + 1043137438281 = 412438^2 + 1021341^2 .

It is not a de Polignac number, because 1213242542125 - 2⁵ = 1213242542093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4852970044 + ... + 4852970293.

It is an arithmetic number, because the mean of its divisors is an integer number (189265836591).

Almost surely, 2^{1213242542125} is an apocalyptic number.

It is an amenable number.

1213242542125 is a deficient number, since it is larger than the sum of its proper divisors (300884150603).

1213242542125 is an frugal number, since it uses more digits than its factorization.

1213242542125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9705940352 (or 9705940342 counting only the distinct ones).

The product of its digits is 38400, while the sum is 34.

Adding to 1213242542125 its reverse (5212452423121), we get a palindrome (6425694965246).

The spelling of 1213242542125 in words is "one trillion, two hundred thirteen billion, two hundred forty-two million, five hundred forty-two thousand, one hundred twenty-five".