21885006229 has 4 divisors (see below), whose sum is σ = 21892833484. Its totient is φ = 21877178976.

The previous prime is 21885006197. The next prime is 21885006263. The reversal of 21885006229 is 92260058812.

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 5755498225 + 16129508004 = 75865^2 + 127002^2 .

It is a cyclic number.

It is not a de Polignac number, because 21885006229 - 2⁵ = 21885006197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21885006289) 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, 3909432 + ... + 3915025.

It is an arithmetic number, because the mean of its divisors is an integer number (5473208371).

Almost surely, 2^21885006229 is an apocalyptic number.

It is an amenable number.

21885006229 is a deficient number, since it is larger than the sum of its proper divisors (7827255).

21885006229 is an equidigital number, since it uses as much as digits as its factorization.

21885006229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7827254.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 21885006229 in words is "twenty-one billion, eight hundred eighty-five million, six thousand, two hundred twenty-nine".