21010232401 has 2 divisors, whose sum is σ = 21010232402. Its totient is φ = 21010232400.

The previous prime is 21010232381. The next prime is 21010232437. The reversal of 21010232401 is 10423201012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20955457600 + 54774801 = 144760^2 + 7401^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010232401 - 2²¹ = 21008135249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010233401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505116200 + 10505116201.

It is an arithmetic number, because the mean of its divisors is an integer number (10505116201).

Almost surely, 2^21010232401 is an apocalyptic number.

It is an amenable number.

21010232401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010232401 is an equidigital number, since it uses as much as digits as its factorization.

21010232401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21010232401 its reverse (10423201012), we get a palindrome (31433433413).

The spelling of 21010232401 in words is "twenty-one billion, ten million, two hundred thirty-two thousand, four hundred one".