21044200427 has 2 divisors, whose sum is σ = 21044200428. Its totient is φ = 21044200426.

The previous prime is 21044200423. The next prime is 21044200477. The reversal of 21044200427 is 72400244012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21044200427 - 2² = 21044200423 is a prime.

It is a super-2 number, since 2×21044200427² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21044200396 and 21044200405.

It is not a weakly prime, because it can be changed into another prime (21044200423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522100213 + 10522100214.

It is an arithmetic number, because the mean of its divisors is an integer number (10522100214).

Almost surely, 2^21044200427 is an apocalyptic number.

21044200427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044200427 is an equidigital number, since it uses as much as digits as its factorization.

21044200427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 26.

Adding to 21044200427 its reverse (72400244012), we get a palindrome (93444444439).

The spelling of 21044200427 in words is "twenty-one billion, forty-four million, two hundred thousand, four hundred twenty-seven".