21012303401 has 2 divisors, whose sum is σ = 21012303402. Its totient is φ = 21012303400.

The previous prime is 21012303383. The next prime is 21012303419. The reversal of 21012303401 is 10430321012.

It is a balanced prime because it is at equal distance from previous prime (21012303383) and next prime (21012303419).

It can be written as a sum of positive squares in only one way, i.e., 13568755225 + 7443548176 = 116485^2 + 86276^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012303401 - 2¹⁸ = 21012041257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21012303401.

It is not a weakly prime, because it can be changed into another prime (21012303461) 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, 10506151700 + 10506151701.

It is an arithmetic number, because the mean of its divisors is an integer number (10506151701).

Almost surely, 2^21012303401 is an apocalyptic number.

It is an amenable number.

21012303401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012303401 is an equidigital number, since it uses as much as digits as its factorization.

21012303401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21012303401 its reverse (10430321012), we get a palindrome (31442624413).

The spelling of 21012303401 in words is "twenty-one billion, twelve million, three hundred three thousand, four hundred one".