21035254044 has 24 divisors (see below), whose sum is σ = 56094011008. Its totient is φ = 6010072560.

The previous prime is 21035254039. The next prime is 21035254061. The reversal of 21035254044 is 44045253012.

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, 125209762 + ... + 125209929.

Almost surely, 2^21035254044 is an apocalyptic number.

It is an amenable number.

21035254044 is an abundant number, since it is smaller than the sum of its proper divisors (35058756964).

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

21035254044 is a wasteful number, since it uses less digits than its factorization.

21035254044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250419705 (or 250419703 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 21035254044 in words is "twenty-one billion, thirty-five million, two hundred fifty-four thousand, forty-four".