21435101 has 2 divisors, whose sum is σ = 21435102. Its totient is φ = 21435100.

The previous prime is 21435077. The next prime is 21435107. The reversal of 21435101 is 10153412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 6604900 = 3851^2 + 2570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21435101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21435107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717550 + 10717551.

It is an arithmetic number, because the mean of its divisors is an integer number (10717551).

Almost surely, 2^21435101 is an apocalyptic number.

It is an amenable number.

21435101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435101 is an equidigital number, since it uses as much as digits as its factorization.

21435101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21435101 is about 4629.8057194660. The cubic root of 21435101 is about 277.7848213266.

Adding to 21435101 its reverse (10153412), we get a palindrome (31588513).

The spelling of 21435101 in words is "twenty-one million, four hundred thirty-five thousand, one hundred one".