2101432121 has 2 divisors, whose sum is σ = 2101432122. Its totient is φ = 2101432120.

The previous prime is 2101432111. The next prime is 2101432189. The reversal of 2101432121 is 1212341012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1355049721 + 746382400 = 36811^2 + 27320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101432121 - 2¹⁸ = 2101169977 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2101432121.

It is not a weakly prime, because it can be changed into another prime (2101432111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050716060 + 1050716061.

It is an arithmetic number, because the mean of its divisors is an integer number (1050716061).

Almost surely, 2^2101432121 is an apocalyptic number.

It is an amenable number.

2101432121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101432121 is an equidigital number, since it uses as much as digits as its factorization.

2101432121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2101432121 is about 45841.3800075870. The cubic root of 2101432121 is about 1280.8702011111.

Adding to 2101432121 its reverse (1212341012), we get a palindrome (3313773133).

It can be divided in two parts, 21014 and 32121, that added together give a palindrome (53135).

The spelling of 2101432121 in words is "two billion, one hundred one million, four hundred thirty-two thousand, one hundred twenty-one".