1821230609244 has 24 divisors (see below), whose sum is σ = 4249808563728. Its totient is φ = 607038230400.

The previous prime is 1821230609243. The next prime is 1821230609281. The reversal of 1821230609244 is 4429060321281.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1821230609196 and 1821230609205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821230609243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4633207 + ... + 5010894.

It is an arithmetic number, because the mean of its divisors is an integer number (177075356822).

Almost surely, 2^{1821230609244} is an apocalyptic number.

It is an amenable number.

1821230609244 is an abundant number, since it is smaller than the sum of its proper divisors (2428577954484).

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

1821230609244 is a wasteful number, since it uses less digits than its factorization.

1821230609244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659845 (or 9659843 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 1821230609244 in words is "one trillion, eight hundred twenty-one billion, two hundred thirty million, six hundred nine thousand, two hundred forty-four".