21068599229 has 4 divisors (see below), whose sum is σ = 21069786876. Its totient is φ = 21067411584.

The previous prime is 21068599199. The next prime is 21068599241. The reversal of 21068599229 is 92299586012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19600560004 + 1468039225 = 140002^2 + 38315^2 .

It is a cyclic number.

It is not a de Polignac number, because 21068599229 - 2⁸ = 21068598973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068599249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566804 + ... + 602829.

It is an arithmetic number, because the mean of its divisors is an integer number (5267446719).

Almost surely, 2^21068599229 is an apocalyptic number.

It is an amenable number.

21068599229 is a deficient number, since it is larger than the sum of its proper divisors (1187647).

21068599229 is a wasteful number, since it uses less digits than its factorization.

21068599229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187646.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 21068599229 in words is "twenty-one billion, sixty-eight million, five hundred ninety-nine thousand, two hundred twenty-nine".