21201210047 has 2 divisors, whose sum is σ = 21201210048. Its totient is φ = 21201210046.

The previous prime is 21201210007. The next prime is 21201210053. The reversal of 21201210047 is 74001210212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201210047 - 2¹² = 21201205951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201210007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600605023 + 10600605024.

It is an arithmetic number, because the mean of its divisors is an integer number (10600605024).

Almost surely, 2^21201210047 is an apocalyptic number.

21201210047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201210047 is an equidigital number, since it uses as much as digits as its factorization.

21201210047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21201210047 its reverse (74001210212), we get a palindrome (95202420259).

The spelling of 21201210047 in words is "twenty-one billion, two hundred one million, two hundred ten thousand, forty-seven".