20999364229 has 2 divisors, whose sum is σ = 20999364230. Its totient is φ = 20999364228.

The previous prime is 20999364209. The next prime is 20999364263. The reversal of 20999364229 is 92246399902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13805780004 + 7193584225 = 117498^2 + 84815^2 .

It is a cyclic number.

It is not a de Polignac number, because 20999364229 - 2²¹ = 20997267077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20999364229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20999364209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499682114 + 10499682115.

It is an arithmetic number, because the mean of its divisors is an integer number (10499682115).

Almost surely, 2^20999364229 is an apocalyptic number.

It is an amenable number.

20999364229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20999364229 is an equidigital number, since it uses as much as digits as its factorization.

20999364229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 55.

The spelling of 20999364229 in words is "twenty billion, nine hundred ninety-nine million, three hundred sixty-four thousand, two hundred twenty-nine".