21035341421 has 2 divisors, whose sum is σ = 21035341422. Its totient is φ = 21035341420.

The previous prime is 21035341409. The next prime is 21035341433. The reversal of 21035341421 is 12414353012.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21035341409) and next prime (21035341433).

It can be written as a sum of positive squares in only one way, i.e., 12947936521 + 8087404900 = 113789^2 + 89930^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035341421 - 2¹⁸ = 21035079277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21035341021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517670710 + 10517670711.

It is an arithmetic number, because the mean of its divisors is an integer number (10517670711).

Almost surely, 2^21035341421 is an apocalyptic number.

It is an amenable number.

21035341421 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035341421 is an equidigital number, since it uses as much as digits as its factorization.

21035341421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21035341421 its reverse (12414353012), we get a palindrome (33449694433).

The spelling of 21035341421 in words is "twenty-one billion, thirty-five million, three hundred forty-one thousand, four hundred twenty-one".