21571719044 has 24 divisors (see below), whose sum is σ = 39397364160. Its totient is φ = 10315461024.

The previous prime is 21571719031. The next prime is 21571719061. The reversal of 21571719044 is 44091717512.

It is a junction number, because it is equal to n+sod(n) for n = 21571718992 and 21571719010.

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, 948227 + ... + 970709.

It is an arithmetic number, because the mean of its divisors is an integer number (1641556840).

Almost surely, 2^21571719044 is an apocalyptic number.

It is an amenable number.

21571719044 is a deficient number, since it is larger than the sum of its proper divisors (17825645116).

21571719044 is a wasteful number, since it uses less digits than its factorization.

21571719044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32939 (or 32937 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 21571719044 in words is "twenty-one billion, five hundred seventy-one million, seven hundred nineteen thousand, forty-four".