21113012420636 has 24 divisors (see below), whose sum is σ = 37807860714624. Its totient is φ = 10310777391600.

The previous prime is 21113012420569. The next prime is 21113012420657. The reversal of 21113012420636 is 63602421031112.

21113012420636 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6550211 + ... + 9226661.

It is an arithmetic number, because the mean of its divisors is an integer number (1575327529776).

Almost surely, 2^{21113012420636} is an apocalyptic number.

It is an amenable number.

21113012420636 is a deficient number, since it is larger than the sum of its proper divisors (16694848293988).

21113012420636 is a wasteful number, since it uses less digits than its factorization.

21113012420636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722361 (or 2722359 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 21113012420636 its reverse (63602421031112), we get a palindrome (84715433451748).

The spelling of 21113012420636 in words is "twenty-one trillion, one hundred thirteen billion, twelve million, four hundred twenty thousand, six hundred thirty-six".