21404220367 has 2 divisors, whose sum is σ = 21404220368. Its totient is φ = 21404220366.

The previous prime is 21404220301. The next prime is 21404220377. The reversal of 21404220367 is 76302240412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21404220367 - 2²³ = 21395831759 is a prime.

It is a super-2 number, since 2×21404220367² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404220377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702110183 + 10702110184.

It is an arithmetic number, because the mean of its divisors is an integer number (10702110184).

Almost surely, 2^21404220367 is an apocalyptic number.

21404220367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404220367 is an equidigital number, since it uses as much as digits as its factorization.

21404220367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

Adding to 21404220367 its reverse (76302240412), we get a palindrome (97706460779).

The spelling of 21404220367 in words is "twenty-one billion, four hundred four million, two hundred twenty thousand, three hundred sixty-seven".