21245715045838 has 8 divisors (see below), whose sum is σ = 31883669009280. Its totient is φ = 10617825376080.

The previous prime is 21245715045769. The next prime is 21245715045847. The reversal of 21245715045838 is 83854051754212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21245715045838² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2516068143 + ... + 2516076586.

It is an arithmetic number, because the mean of its divisors is an integer number (3985458626160).

Almost surely, 2^{21245715045838} is an apocalyptic number.

21245715045838 is a deficient number, since it is larger than the sum of its proper divisors (10637953963442).

21245715045838 is a wasteful number, since it uses less digits than its factorization.

21245715045838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5032146842.

The product of its (nonzero) digits is 10752000, while the sum is 55.

The spelling of 21245715045838 in words is "twenty-one trillion, two hundred forty-five billion, seven hundred fifteen million, forty-five thousand, eight hundred thirty-eight".