1213011232121 has 4 divisors (see below), whose sum is σ = 1306319788452. Its totient is φ = 1119702675792.

The previous prime is 1213011232063. The next prime is 1213011232157. The reversal of 1213011232121 is 1212321103121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 623248670521 + 589762561600 = 789461^2 + 767960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213011232121 - 2²² = 1213007037817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213011232093 and 1213011232102.

It is not an unprimeable number, because it can be changed into a prime (1213011231121) 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, 46654278146 + ... + 46654278171.

It is an arithmetic number, because the mean of its divisors is an integer number (326579947113).

Almost surely, 2^{1213011232121} is an apocalyptic number.

It is an amenable number.

1213011232121 is a deficient number, since it is larger than the sum of its proper divisors (93308556331).

1213011232121 is an equidigital number, since it uses as much as digits as its factorization.

1213011232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93308556330.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1213011232121 its reverse (1212321103121), we get a palindrome (2425332335242).

The spelling of 1213011232121 in words is "one trillion, two hundred thirteen billion, eleven million, two hundred thirty-two thousand, one hundred twenty-one".