212120123123131 has 4 divisors (see below), whose sum is σ = 212124091524912. Its totient is φ = 212116154721352.

The previous prime is 212120123123119. The next prime is 212120123123191. The reversal of 212120123123131 is 131321321021212.

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

It is a cyclic number.

It is not a de Polignac number, because 212120123123131 - 2²³ = 212120114734523 is a prime.

It is a super-2 number, since 2×212120123123131² (a number of 29 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 = 212120123123096 and 212120123123105.

It is not an unprimeable number, because it can be changed into a prime (212120123123191) 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, 1984120711 + ... + 1984227616.

It is an arithmetic number, because the mean of its divisors is an integer number (53031022881228).

Almost surely, 2^{212120123123131} is an apocalyptic number.

212120123123131 is a deficient number, since it is larger than the sum of its proper divisors (3968401781).

212120123123131 is an equidigital number, since it uses as much as digits as its factorization.

212120123123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968401780.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 212120123123131 its reverse (131321321021212), we get a palindrome (343441444144343).

The spelling of 212120123123131 in words is "two hundred twelve trillion, one hundred twenty billion, one hundred twenty-three million, one hundred twenty-three thousand, one hundred thirty-one".