21232123208 has 32 divisors (see below), whose sum is σ = 42164517600. Its totient is φ = 9988622592.

The previous prime is 21232123207. The next prime is 21232123217. The reversal of 21232123208 is 80232123212.

It is a super-2 number, since 2×21232123208² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21232123207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476291 + ... + 518957.

It is an arithmetic number, because the mean of its divisors is an integer number (1317641175).

Almost surely, 2^21232123208 is an apocalyptic number.

It is an amenable number.

21232123208 is a deficient number, since it is larger than the sum of its proper divisors (20932394392).

21232123208 is a wasteful number, since it uses less digits than its factorization.

21232123208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46349 (or 46345 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21232123208 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, two hundred eight".