21354661010351 has 2 divisors, whose sum is σ = 21354661010352. Its totient is φ = 21354661010350.

The previous prime is 21354661010341. The next prime is 21354661010369. The reversal of 21354661010351 is 15301016645312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21354661010351 - 2¹⁸ = 21354660748207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21354661010341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677330505175 + 10677330505176.

It is an arithmetic number, because the mean of its divisors is an integer number (10677330505176).

Almost surely, 2^{21354661010351} is an apocalyptic number.

21354661010351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354661010351 is an equidigital number, since it uses as much as digits as its factorization.

21354661010351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 21354661010351 its reverse (15301016645312), we get a palindrome (36655677655663).

The spelling of 21354661010351 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred sixty-one million, ten thousand, three hundred fifty-one".