21120212104 has 64 divisors (see below), whose sum is σ = 41836435200. Its totient is φ = 9980216064.

The previous prime is 21120212027. The next prime is 21120212129. The reversal of 21120212104 is 40121202112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5986389 + ... + 5989915.

It is an arithmetic number, because the mean of its divisors is an integer number (653694300).

Almost surely, 2^21120212104 is an apocalyptic number.

It is an amenable number.

21120212104 is a deficient number, since it is larger than the sum of its proper divisors (20716223096).

21120212104 is a wasteful number, since it uses less digits than its factorization.

21120212104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120212104 its reverse (40121202112), we get a palindrome (61241414216).

The spelling of 21120212104 in words is "twenty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred four".