21827994367 has 2 divisors, whose sum is σ = 21827994368. Its totient is φ = 21827994366.

The previous prime is 21827994337. The next prime is 21827994389. The reversal of 21827994367 is 76349972812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21827994367 is a prime.

It is a super-2 number, since 2×21827994367² (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 (21827994337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10913997183 + 10913997184.

It is an arithmetic number, because the mean of its divisors is an integer number (10913997184).

Almost surely, 2^21827994367 is an apocalyptic number.

21827994367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21827994367 is an equidigital number, since it uses as much as digits as its factorization.

21827994367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The spelling of 21827994367 in words is "twenty-one billion, eight hundred twenty-seven million, nine hundred ninety-four thousand, three hundred sixty-seven".