21212125233 has 16 divisors (see below), whose sum is σ = 30462941376. Its totient is φ = 13051684800.

The previous prime is 21212125229. The next prime is 21212125243. The reversal of 21212125233 is 33252121212.

It is not a de Polignac number, because 21212125233 - 2² = 21212125229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212125223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254091 + ... + 327087.

It is an arithmetic number, because the mean of its divisors is an integer number (1903933836).

Almost surely, 2^21212125233 is an apocalyptic number.

It is an amenable number.

21212125233 is a deficient number, since it is larger than the sum of its proper divisors (9250816143).

21212125233 is a wasteful number, since it uses less digits than its factorization.

21212125233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80464.

The product of its digits is 1440, while the sum is 24.

Adding to 21212125233 its reverse (33252121212), we get a palindrome (54464246445).

The spelling of 21212125233 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-five thousand, two hundred thirty-three".