21921329650 has 48 divisors (see below), whose sum is σ = 44497964448. Its totient is φ = 7968240000.

The previous prime is 21921329627. The next prime is 21921329659. The reversal of 21921329650 is 5692312912.

It is not an unprimeable number, because it can be changed into a prime (21921329659) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1733350 + ... + 1745950.

It is an arithmetic number, because the mean of its divisors is an integer number (927040926).

Almost surely, 2^21921329650 is an apocalyptic number.

21921329650 is an abundant number, since it is smaller than the sum of its proper divisors (22576634798).

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

21921329650 is a wasteful number, since it uses less digits than its factorization.

21921329650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15787 (or 15782 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 21921329650 in words is "twenty-one billion, nine hundred twenty-one million, three hundred twenty-nine thousand, six hundred fifty".