21208723332 has 24 divisors (see below), whose sum is σ = 50637883296. Its totient is φ = 6905165568.

The previous prime is 21208723313. The next prime is 21208723363. The reversal of 21208723332 is 23332780212.

It is a junction number, because it is equal to n+sod(n) for n = 21208723293 and 21208723302.

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, 20550573 + ... + 20551604.

It is an arithmetic number, because the mean of its divisors is an integer number (2109911804).

Almost surely, 2^21208723332 is an apocalyptic number.

It is an amenable number.

21208723332 is an abundant number, since it is smaller than the sum of its proper divisors (29429159964).

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

21208723332 is a wasteful number, since it uses less digits than its factorization.

21208723332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41102227 (or 41102225 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The spelling of 21208723332 in words is "twenty-one billion, two hundred eight million, seven hundred twenty-three thousand, three hundred thirty-two".