21034401404351 has 2 divisors, whose sum is σ = 21034401404352. Its totient is φ = 21034401404350.

The previous prime is 21034401404347. The next prime is 21034401404377. The reversal of 21034401404351 is 15340410443012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21034401404351 - 2² = 21034401404347 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21034401404311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517200702175 + 10517200702176.

It is an arithmetic number, because the mean of its divisors is an integer number (10517200702176).

Almost surely, 2^{21034401404351} is an apocalyptic number.

21034401404351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034401404351 is an equidigital number, since it uses as much as digits as its factorization.

21034401404351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21034401404351 its reverse (15340410443012), we get a palindrome (36374811847363).

The spelling of 21034401404351 in words is "twenty-one trillion, thirty-four billion, four hundred one million, four hundred four thousand, three hundred fifty-one".