21210342332 has 18 divisors (see below), whose sum is σ = 39429955152. Its totient is φ = 9981337024.

The previous prime is 21210342311. The next prime is 21210342397. The reversal of 21210342332 is 23324301212.

It is a junction number, because it is equal to n+sod(n) for n = 21210342298 and 21210342307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9172868 + ... + 9175179.

It is an arithmetic number, because the mean of its divisors is an integer number (2190553064).

Almost surely, 2^21210342332 is an apocalyptic number.

It is an amenable number.

21210342332 is a deficient number, since it is larger than the sum of its proper divisors (18219612820).

21210342332 is a wasteful number, since it uses less digits than its factorization.

21210342332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18348085 (or 18348066 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21210342332 its reverse (23324301212), we get a palindrome (44534643544).

The spelling of 21210342332 in words is "twenty-one billion, two hundred ten million, three hundred forty-two thousand, three hundred thirty-two".