21345288227 has 2 divisors, whose sum is σ = 21345288228. Its totient is φ = 21345288226.

The previous prime is 21345288157. The next prime is 21345288233. The reversal of 21345288227 is 72288254312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21345288227 - 2²² = 21341093923 is a prime.

It is a super-4 number, since 4×21345288227⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21345288277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672644113 + 10672644114.

It is an arithmetic number, because the mean of its divisors is an integer number (10672644114).

Almost surely, 2^21345288227 is an apocalyptic number.

21345288227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21345288227 is an equidigital number, since it uses as much as digits as its factorization.

21345288227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 430080, while the sum is 44.

The spelling of 21345288227 in words is "twenty-one billion, three hundred forty-five million, two hundred eighty-eight thousand, two hundred twenty-seven".