21555041332 has 12 divisors (see below), whose sum is σ = 41150533536. Its totient is φ = 9797746040.

The previous prime is 21555041317. The next prime is 21555041341. The reversal of 21555041332 is 23314055512.

It is a junction number, because it is equal to n+sod(n) for n = 21555041294 and 21555041303.

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, 244943608 + ... + 244943695.

It is an arithmetic number, because the mean of its divisors is an integer number (3429211128).

Almost surely, 2^21555041332 is an apocalyptic number.

21555041332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21555041332 is a deficient number, since it is larger than the sum of its proper divisors (19595492204).

21555041332 is a wasteful number, since it uses less digits than its factorization.

21555041332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489887318 (or 489887316 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 21555041332 its reverse (23314055512), we get a palindrome (44869096844).

The spelling of 21555041332 in words is "twenty-one billion, five hundred fifty-five million, forty-one thousand, three hundred thirty-two".