21113120435 has 32 divisors (see below), whose sum is σ = 29444325120. Its totient is φ = 14371516800.

The previous prime is 21113120401. The next prime is 21113120459. The reversal of 21113120435 is 53402131112.

It is not a de Polignac number, because 21113120435 - 2¹⁶ = 21113054899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113120435.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34976 + ... + 208445.

It is an arithmetic number, because the mean of its divisors is an integer number (920135160).

Almost surely, 2^21113120435 is an apocalyptic number.

21113120435 is a deficient number, since it is larger than the sum of its proper divisors (8331204685).

21113120435 is a wasteful number, since it uses less digits than its factorization.

21113120435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243539.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21113120435 its reverse (53402131112), we get a palindrome (74515251547).

The spelling of 21113120435 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty thousand, four hundred thirty-five".