21221355320047 has 2 divisors, whose sum is σ = 21221355320048. Its totient is φ = 21221355320046.

The previous prime is 21221355320029. The next prime is 21221355320063. The reversal of 21221355320047 is 74002355312212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221355320047 - 2⁴³ = 12425262297839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221355319988 and 21221355320015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221355320017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610677660023 + 10610677660024.

It is an arithmetic number, because the mean of its divisors is an integer number (10610677660024).

Almost surely, 2^{21221355320047} is an apocalyptic number.

21221355320047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221355320047 is an equidigital number, since it uses as much as digits as its factorization.

21221355320047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 21221355320047 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-five million, three hundred twenty thousand, forty-seven".