21227064919 has 2 divisors, whose sum is σ = 21227064920. Its totient is φ = 21227064918.

The previous prime is 21227064907. The next prime is 21227064923. The reversal of 21227064919 is 91946072212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21227064919 - 2⁷ = 21227064791 is a prime.

It is a super-2 number, since 2×21227064919² (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 (21227064959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613532459 + 10613532460.

It is an arithmetic number, because the mean of its divisors is an integer number (10613532460).

Almost surely, 2^21227064919 is an apocalyptic number.

21227064919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227064919 is an equidigital number, since it uses as much as digits as its factorization.

21227064919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 21227064919 in words is "twenty-one billion, two hundred twenty-seven million, sixty-four thousand, nine hundred nineteen".