12121320121031 has 16 divisors (see below), whose sum is σ = 13485721466880. Its totient is φ = 10801062873120.

The previous prime is 12121320121007. The next prime is 12121320121087. The reversal of 12121320121031 is 13012102312121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121320121031 is a prime.

It is a super-2 number, since 2×12121320121031² (a number of 27 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 = 12121320120994 and 12121320121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121320121091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9399695 + ... + 10611168.

It is an arithmetic number, because the mean of its divisors is an integer number (842857591680).

Almost surely, 2^{12121320121031} is an apocalyptic number.

12121320121031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121320121031 is a deficient number, since it is larger than the sum of its proper divisors (1364401345849).

12121320121031 is a wasteful number, since it uses less digits than its factorization.

12121320121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20011966.

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

Adding to 12121320121031 its reverse (13012102312121), we get a palindrome (25133422433152).

The spelling of 12121320121031 in words is "twelve trillion, one hundred twenty-one billion, three hundred twenty million, one hundred twenty-one thousand, thirty-one".