21220099495823 has 2 divisors, whose sum is σ = 21220099495824. Its totient is φ = 21220099495822.

The previous prime is 21220099495717. The next prime is 21220099495871. The reversal of 21220099495823 is 32859499002212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220099495823 - 2⁴² = 16822052984719 is a prime.

It is a super-2 number, since 2×21220099495823² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220099495223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610049747911 + 10610049747912.

It is an arithmetic number, because the mean of its divisors is an integer number (10610049747912).

Almost surely, 2^{21220099495823} is an apocalyptic number.

21220099495823 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220099495823 is an equidigital number, since it uses as much as digits as its factorization.

21220099495823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 21220099495823 in words is "twenty-one trillion, two hundred twenty billion, ninety-nine million, four hundred ninety-five thousand, eight hundred twenty-three".