121201212031 has 6 divisors (see below), whose sum is σ = 125524680632. Its totient is φ = 117021859080.

The previous prime is 121201212001. The next prime is 121201212049. The reversal of 121201212031 is 130212102121.

It is not a de Polignac number, because 121201212031 - 2⁹ = 121201211519 is a prime.

It is a super-2 number, since 2×121201212031² (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 = 121201211996 and 121201212014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201212001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72056955 + ... + 72058636.

Almost surely, 2^121201212031 is an apocalyptic number.

121201212031 is a deficient number, since it is larger than the sum of its proper divisors (4323468601).

121201212031 is an equidigital number, since it uses as much as digits as its factorization.

121201212031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144115649 (or 144115620 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121201212031 its reverse (130212102121), we get a palindrome (251413314152).

The spelling of 121201212031 in words is "one hundred twenty-one billion, two hundred one million, two hundred twelve thousand, thirty-one".