21120111042 has 32 divisors (see below), whose sum is σ = 42395560704. Its totient is φ = 7014176400.

The previous prime is 21120111037. The next prime is 21120111059. The reversal of 21120111042 is 24011102112.

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, 4499917 + ... + 4504607.

It is an arithmetic number, because the mean of its divisors is an integer number (1324861272).

Almost surely, 2^21120111042 is an apocalyptic number.

21120111042 is an abundant number, since it is smaller than the sum of its proper divisors (21275449662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120111042 is a wasteful number, since it uses less digits than its factorization.

21120111042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7294.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120111042 its reverse (24011102112), we get a palindrome (45131213154).

The spelling of 21120111042 in words is "twenty-one billion, one hundred twenty million, one hundred eleven thousand, forty-two".