21113134120 has 64 divisors (see below), whose sum is σ = 51186255120. Its totient is φ = 7791427584.

The previous prime is 21113134109. The next prime is 21113134121. The reversal of 21113134120 is 2143131112.

It can be written as a sum of positive squares in 8 ways, for example, as 5038444324 + 16074689796 = 70982^2 + 126786^2 .

It is not an unprimeable number, because it can be changed into a prime (21113134121) 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, 1057672 + ... + 1077448.

Almost surely, 2^21113134120 is an apocalyptic number.

21113134120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113134120 is an abundant number, since it is smaller than the sum of its proper divisors (30073121000).

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

21113134120 is a wasteful number, since it uses less digits than its factorization.

21113134120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21854 (or 21850 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21113134120 its reverse (2143131112), we get a palindrome (23256265232).

The spelling of 21113134120 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-four thousand, one hundred twenty".