21200121012047 has 2 divisors, whose sum is σ = 21200121012048. Its totient is φ = 21200121012046.

The previous prime is 21200121012001. The next prime is 21200121012097. The reversal of 21200121012047 is 74021012100212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21200121012047 - 2¹⁰ = 21200121011023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200121012097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600060506023 + 10600060506024.

It is an arithmetic number, because the mean of its divisors is an integer number (10600060506024).

Almost surely, 2^{21200121012047} is an apocalyptic number.

21200121012047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200121012047 is an equidigital number, since it uses as much as digits as its factorization.

21200121012047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21200121012047 its reverse (74021012100212), we get a palindrome (95221133112259).

The spelling of 21200121012047 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one million, twelve thousand, forty-seven".