21202219995829 has 2 divisors, whose sum is σ = 21202219995830. Its totient is φ = 21202219995828.

The previous prime is 21202219995791. The next prime is 21202219995871. The reversal of 21202219995829 is 92859991220212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19553217297604 + 1649002698225 = 4421902^2 + 1284135^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202219995829 - 2¹⁷ = 21202219864757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202219995899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601109997914 + 10601109997915.

It is an arithmetic number, because the mean of its divisors is an integer number (10601109997915).

Almost surely, 2^{21202219995829} is an apocalyptic number.

It is an amenable number.

21202219995829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202219995829 is an equidigital number, since it uses as much as digits as its factorization.

21202219995829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 61.

The spelling of 21202219995829 in words is "twenty-one trillion, two hundred two billion, two hundred nineteen million, nine hundred ninety-five thousand, eight hundred twenty-nine".