2121201031 has 2 divisors, whose sum is σ = 2121201032. Its totient is φ = 2121201030.

The previous prime is 2121201029. The next prime is 2121201053. The reversal of 2121201031 is 1301021212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121201031 - 2¹ = 2121201029 is a prime.

It is a super-2 number, since 2×2121201031² = 8998987627830925922, which contains 22 as substring.

Together with 2121201029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121201431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060600515 + 1060600516.

It is an arithmetic number, because the mean of its divisors is an integer number (1060600516).

Almost surely, 2^2121201031 is an apocalyptic number.

2121201031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121201031 is an equidigital number, since it uses as much as digits as its factorization.

2121201031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2121201031 is about 46056.4982494327. The cubic root of 2121201031 is about 1284.8742034949.

Adding to 2121201031 its reverse (1301021212), we get a palindrome (3422222243).

The spelling of 2121201031 in words is "two billion, one hundred twenty-one million, two hundred one thousand, thirty-one".