21641211232 has 24 divisors (see below), whose sum is σ = 43206225552. Its totient is φ = 10668201600.

The previous prime is 21641211217. The next prime is 21641211281. The reversal of 21641211232 is 23211214612.

It is a junction number, because it is equal to n+sod(n) for n = 21641211197 and 21641211206.

It is a congruent number.

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, 4760319 + ... + 4764862.

It is an arithmetic number, because the mean of its divisors is an integer number (1800259398).

Almost surely, 2^21641211232 is an apocalyptic number.

It is an amenable number.

21641211232 is a deficient number, since it is larger than the sum of its proper divisors (21565014320).

21641211232 is an equidigital number, since it uses as much as digits as its factorization.

21641211232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9525262 (or 9525254 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

Adding to 21641211232 its reverse (23211214612), we get a palindrome (44852425844).

The spelling of 21641211232 in words is "twenty-one billion, six hundred forty-one million, two hundred eleven thousand, two hundred thirty-two".