21224496427 has 2 divisors, whose sum is σ = 21224496428. Its totient is φ = 21224496426.

The previous prime is 21224496317. The next prime is 21224496451. The reversal of 21224496427 is 72469442212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224496427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21224596427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612248213 + 10612248214.

It is an arithmetic number, because the mean of its divisors is an integer number (10612248214).

Almost surely, 2^21224496427 is an apocalyptic number.

21224496427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224496427 is an equidigital number, since it uses as much as digits as its factorization.

21224496427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 43.

The spelling of 21224496427 in words is "twenty-one billion, two hundred twenty-four million, four hundred ninety-six thousand, four hundred twenty-seven".