21806643341 has 16 divisors (see below), whose sum is σ = 25017248256. Its totient is φ = 18619963776.

The previous prime is 21806643329. The next prime is 21806643371. The reversal of 21806643341 is 14334660812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21806643341 - 2¹⁴ = 21806626957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21806643295 and 21806643304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21806643371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5072705 + ... + 5077001.

It is an arithmetic number, because the mean of its divisors is an integer number (1563578016).

Almost surely, 2^21806643341 is an apocalyptic number.

It is an amenable number.

21806643341 is a deficient number, since it is larger than the sum of its proper divisors (3210604915).

21806643341 is a wasteful number, since it uses less digits than its factorization.

21806643341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6908.

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 21806643341 in words is "twenty-one billion, eight hundred six million, six hundred forty-three thousand, three hundred forty-one".