21403221342367 has 2 divisors, whose sum is σ = 21403221342368. Its totient is φ = 21403221342366.

The previous prime is 21403221342353. The next prime is 21403221342463. The reversal of 21403221342367 is 76324312230412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21403221342367 - 2³⁹ = 20853465528479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21403221342467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701610671183 + 10701610671184.

It is an arithmetic number, because the mean of its divisors is an integer number (10701610671184).

Almost surely, 2^{21403221342367} is an apocalyptic number.

21403221342367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403221342367 is an equidigital number, since it uses as much as digits as its factorization.

21403221342367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 40.

Adding to 21403221342367 its reverse (76324312230412), we get a palindrome (97727533572779).

The spelling of 21403221342367 in words is "twenty-one trillion, four hundred three billion, two hundred twenty-one million, three hundred forty-two thousand, three hundred sixty-seven".