121212040031 has 4 divisors (see below), whose sum is σ = 126482128752. Its totient is φ = 115941951312.

The previous prime is 121212040021. The next prime is 121212040049. The reversal of 121212040031 is 130040212121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130040212121 = 109 ⋅1193029469.

It is a cyclic number.

It is not a de Polignac number, because 121212040031 - 2¹⁸ = 121211777887 is a prime.

It is a super-2 number, since 2×121212040031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212039991 and 121212040009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212040021) 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, 2635044326 + ... + 2635044371.

It is an arithmetic number, because the mean of its divisors is an integer number (31620532188).

Almost surely, 2^121212040031 is an apocalyptic number.

121212040031 is a deficient number, since it is larger than the sum of its proper divisors (5270088721).

121212040031 is an equidigital number, since it uses as much as digits as its factorization.

121212040031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270088720.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121212040031 its reverse (130040212121), we get a palindrome (251252252152).

The spelling of 121212040031 in words is "one hundred twenty-one billion, two hundred twelve million, forty thousand, thirty-one".