21155153044 has 48 divisors (see below), whose sum is σ = 39056371200. Its totient is φ = 10011609216.

The previous prime is 21155153009. The next prime is 21155153059. The reversal of 21155153044 is 44035155112.

It is a super-3 number, since 3×21155153044³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21155152997 and 21155153015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2548669 + ... + 2556955.

It is an arithmetic number, because the mean of its divisors is an integer number (813674400).

Almost surely, 2^21155153044 is an apocalyptic number.

It is an amenable number.

21155153044 is a deficient number, since it is larger than the sum of its proper divisors (17901218156).

21155153044 is a wasteful number, since it uses less digits than its factorization.

21155153044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8752 (or 8750 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 21155153044 in words is "twenty-one billion, one hundred fifty-five million, one hundred fifty-three thousand, forty-four".