21224046335646 has 64 divisors (see below), whose sum is σ = 54153048508416. Its totient is φ = 5384536063200.

The previous prime is 21224046335641. The next prime is 21224046335759. The reversal of 21224046335646 is 64653364042212.

It is a junction number, because it is equal to n+sod(n) for n = 21224046335595 and 21224046335604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224046335641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 534160300 + ... + 534200031.

It is an arithmetic number, because the mean of its divisors is an integer number (846141382944).

Almost surely, 2^{21224046335646} is an apocalyptic number.

21224046335646 is an abundant number, since it is smaller than the sum of its proper divisors (32929002172770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21224046335646 is a wasteful number, since it uses less digits than its factorization.

21224046335646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068360397.

The product of its (nonzero) digits is 4976640, while the sum is 48.

The spelling of 21224046335646 in words is "twenty-one trillion, two hundred twenty-four billion, forty-six million, three hundred thirty-five thousand, six hundred forty-six".