21329495642 has 32 divisors (see below), whose sum is σ = 40120520832. Its totient is φ = 8278830144.

The previous prime is 21329495609. The next prime is 21329495647. The reversal of 21329495642 is 24659492312.

It is not an unprimeable number, because it can be changed into a prime (21329495647) 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 15 ways as a sum of consecutive naturals, for example, 1095968 + ... + 1115259.

It is an arithmetic number, because the mean of its divisors is an integer number (1253766276).

Almost surely, 2^21329495642 is an apocalyptic number.

21329495642 is a deficient number, since it is larger than the sum of its proper divisors (18791025190).

21329495642 is a wasteful number, since it uses less digits than its factorization.

21329495642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211302.

The product of its digits is 933120, while the sum is 47.

The spelling of 21329495642 in words is "twenty-one billion, three hundred twenty-nine million, four hundred ninety-five thousand, six hundred forty-two".