21212032113 has 32 divisors (see below), whose sum is σ = 32091396480. Its totient is φ = 13842803520.

The previous prime is 21212032097. The next prime is 21212032123. The reversal of 21212032113 is 31123021212.

21212032113 is a `hidden beast` number, since 212 + 120 + 321 + 13 = 666.

It is not a de Polignac number, because 21212032113 - 2⁴ = 21212032097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212032123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 617203 + ... + 650663.

It is an arithmetic number, because the mean of its divisors is an integer number (1002856140).

Almost surely, 2^21212032113 is an apocalyptic number.

It is an amenable number.

21212032113 is a deficient number, since it is larger than the sum of its proper divisors (10879364367).

21212032113 is a wasteful number, since it uses less digits than its factorization.

21212032113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33966 (or 33960 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21212032113 its reverse (31123021212), we get a palindrome (52335053325).

The spelling of 21212032113 in words is "twenty-one billion, two hundred twelve million, thirty-two thousand, one hundred thirteen".