21350561232 has 320 divisors, whose sum is σ = 74279245824. Its totient is φ = 5103544320.

The previous prime is 21350561227. The next prime is 21350561257. The reversal of 21350561232 is 23216505312.

It is a self number, because there is not a number n which added to its sum of digits gives 21350561232.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28203798 + ... + 28204554.

Almost surely, 2^21350561232 is an apocalyptic number.

21350561232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21350561232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37139622912).

21350561232 is an abundant number, since it is smaller than the sum of its proper divisors (52928684592).

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

21350561232 is a wasteful number, since it uses less digits than its factorization.

21350561232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 1380 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 21350561232 in words is "twenty-one billion, three hundred fifty million, five hundred sixty-one thousand, two hundred thirty-two".