21201431227 has 2 divisors, whose sum is σ = 21201431228. Its totient is φ = 21201431226.

The previous prime is 21201431203. The next prime is 21201431233. The reversal of 21201431227 is 72213410212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201431227 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201437227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600715613 + 10600715614.

It is an arithmetic number, because the mean of its divisors is an integer number (10600715614).

Almost surely, 2^21201431227 is an apocalyptic number.

21201431227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201431227 is an equidigital number, since it uses as much as digits as its factorization.

21201431227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 21201431227 its reverse (72213410212), we get a palindrome (93414841439).

The spelling of 21201431227 in words is "twenty-one billion, two hundred one million, four hundred thirty-one thousand, two hundred twenty-seven".