21213240332 has 12 divisors (see below), whose sum is σ = 37124199840. Its totient is φ = 10606326096.

The previous prime is 21213240319. The next prime is 21213240397. The reversal of 21213240332 is 23304231212.

It is a junction number, because it is equal to n+sod(n) for n = 21213240298 and 21213240307.

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, 211958 + ... + 295554.

It is an arithmetic number, because the mean of its divisors is an integer number (3093683320).

Almost surely, 2^21213240332 is an apocalyptic number.

It is an amenable number.

21213240332 is a deficient number, since it is larger than the sum of its proper divisors (15910959508).

21213240332 is a wasteful number, since it uses less digits than its factorization.

21213240332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147040 (or 147038 counting only the distinct ones).

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

Adding to 21213240332 its reverse (23304231212), we get a palindrome (44517471544).

The spelling of 21213240332 in words is "twenty-one billion, two hundred thirteen million, two hundred forty thousand, three hundred thirty-two".