21352228229 has 2 divisors, whose sum is σ = 21352228230. Its totient is φ = 21352228228.

The previous prime is 21352228223. The next prime is 21352228231. The reversal of 21352228229 is 92282225312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13700702500 + 7651525729 = 117050^2 + 87473^2 .

It is a cyclic number.

It is not a de Polignac number, because 21352228229 - 2¹⁶ = 21352162693 is a prime.

Together with 21352228231, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21352228192 and 21352228201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21352228223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676114114 + 10676114115.

It is an arithmetic number, because the mean of its divisors is an integer number (10676114115).

Almost surely, 2^21352228229 is an apocalyptic number.

It is an amenable number.

21352228229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352228229 is an equidigital number, since it uses as much as digits as its factorization.

21352228229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The spelling of 21352228229 in words is "twenty-one billion, three hundred fifty-two million, two hundred twenty-eight thousand, two hundred twenty-nine".