21428164619 has 2 divisors, whose sum is σ = 21428164620. Its totient is φ = 21428164618.

The previous prime is 21428164547. The next prime is 21428164631. The reversal of 21428164619 is 91646182412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21428164619 is a prime.

It is a super-2 number, since 2×21428164619² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21428164619.

It is not a weakly prime, because it can be changed into another prime (21428164649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10714082309 + 10714082310.

It is an arithmetic number, because the mean of its divisors is an integer number (10714082310).

Almost surely, 2^21428164619 is an apocalyptic number.

21428164619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21428164619 is an equidigital number, since it uses as much as digits as its factorization.

21428164619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The spelling of 21428164619 in words is "twenty-one billion, four hundred twenty-eight million, one hundred sixty-four thousand, six hundred nineteen".