21212100002047 has 2 divisors, whose sum is σ = 21212100002048. Its totient is φ = 21212100002046.

The previous prime is 21212100001979. The next prime is 21212100002089. The reversal of 21212100002047 is 74020000121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212100002047 - 2³⁹ = 20662344188159 is a prime.

It is a super-3 number, since 3×21212100002047³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212100002747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606050001023 + 10606050001024.

It is an arithmetic number, because the mean of its divisors is an integer number (10606050001024).

Almost surely, 2^{21212100002047} is an apocalyptic number.

21212100002047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212100002047 is an equidigital number, since it uses as much as digits as its factorization.

21212100002047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21212100002047 its reverse (74020000121212), we get a palindrome (95232100123259).

The spelling of 21212100002047 in words is "twenty-one trillion, two hundred twelve billion, one hundred million, two thousand, forty-seven".