21201022229 has 2 divisors, whose sum is σ = 21201022230. Its totient is φ = 21201022228.

The previous prime is 21201022147. The next prime is 21201022231. The reversal of 21201022229 is 92222010212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21089719729 + 111302500 = 145223^2 + 10550^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201022229 - 2³² = 16906054933 is a prime.

Together with 21201022231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201022429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600511114 + 10600511115.

It is an arithmetic number, because the mean of its divisors is an integer number (10600511115).

Almost surely, 2^21201022229 is an apocalyptic number.

It is an amenable number.

21201022229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201022229 is an equidigital number, since it uses as much as digits as its factorization.

21201022229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21201022229 in words is "twenty-one billion, two hundred one million, twenty-two thousand, two hundred twenty-nine".