21393535540244 has 24 divisors (see below), whose sum is σ = 42790033137600. Its totient is φ = 9168023362176.

The previous prime is 21393535540199. The next prime is 21393535540259. The reversal of 21393535540244 is 44204553539312.

It is a junction number, because it is equal to n+sod(n) for n = 21393535540192 and 21393535540201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26035142 + ... + 26844285.

It is an arithmetic number, because the mean of its divisors is an integer number (1782918047400).

Almost surely, 2^{21393535540244} is an apocalyptic number.

It is an amenable number.

21393535540244 is an abundant number, since it is smaller than the sum of its proper divisors (21396497597356).

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

21393535540244 is a wasteful number, since it uses less digits than its factorization.

21393535540244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52893887 (or 52893885 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 21393535540244 in words is "twenty-one trillion, three hundred ninety-three billion, five hundred thirty-five million, five hundred forty thousand, two hundred forty-four".