21203100047 has 2 divisors, whose sum is σ = 21203100048. Its totient is φ = 21203100046.

The previous prime is 21203100011. The next prime is 21203100053. The reversal of 21203100047 is 74000130212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203100047 - 2¹⁴ = 21203083663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203100547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601550023 + 10601550024.

It is an arithmetic number, because the mean of its divisors is an integer number (10601550024).

Almost surely, 2^21203100047 is an apocalyptic number.

21203100047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203100047 is an equidigital number, since it uses as much as digits as its factorization.

21203100047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

Adding to 21203100047 its reverse (74000130212), we get a palindrome (95203230259).

The spelling of 21203100047 in words is "twenty-one billion, two hundred three million, one hundred thousand, forty-seven".