21221020002047 has 2 divisors, whose sum is σ = 21221020002048. Its totient is φ = 21221020002046.

The previous prime is 21221020001999. The next prime is 21221020002107. The reversal of 21221020002047 is 74020002012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221020002047 - 2²⁸ = 21220751566591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221020001047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610510001023 + 10610510001024.

It is an arithmetic number, because the mean of its divisors is an integer number (10610510001024).

Almost surely, 2^{21221020002047} is an apocalyptic number.

21221020002047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221020002047 is an equidigital number, since it uses as much as digits as its factorization.

21221020002047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

Adding to 21221020002047 its reverse (74020002012212), we get a palindrome (95241022014259).

The spelling of 21221020002047 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two thousand, forty-seven".