2121000031 has 2 divisors, whose sum is σ = 2121000032. Its totient is φ = 2121000030.

The previous prime is 2121000023. The next prime is 2121000043. The reversal of 2121000031 is 1300001212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121000031 - 2³ = 2121000023 is a prime.

It is a super-2 number, since 2×2121000031² = 8997282263004001922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2120999981 and 2121000017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121000731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060500015 + 1060500016.

It is an arithmetic number, because the mean of its divisors is an integer number (1060500016).

Almost surely, 2^2121000031 is an apocalyptic number.

2121000031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121000031 is an equidigital number, since it uses as much as digits as its factorization.

2121000031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2121000031 is about 46054.3160952369. The cubic root of 2121000031 is about 1284.8336183313.

Adding to 2121000031 its reverse (1300001212), we get a palindrome (3421001243).

The spelling of 2121000031 in words is "two billion, one hundred twenty-one million, thirty-one", and thus it is an aban number.