21116021200436 has 96 divisors (see below), whose sum is σ = 39016780185600. Its totient is φ = 9985995532800.

The previous prime is 21116021200411. The next prime is 21116021200441. The reversal of 21116021200436 is 63400212061112.

It is a super-2 number, since 2×21116021200436² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 21116021200399 and 21116021200408.

It is a congruent number.

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, 546051710 + ... + 546090378.

It is an arithmetic number, because the mean of its divisors is an integer number (406424793600).

Almost surely, 2^{21116021200436} is an apocalyptic number.

It is an amenable number.

21116021200436 is a deficient number, since it is larger than the sum of its proper divisors (17900758985164).

21116021200436 is a wasteful number, since it uses less digits than its factorization.

21116021200436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39297 (or 39295 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 21116021200436 its reverse (63400212061112), we get a palindrome (84516233261548).

The spelling of 21116021200436 in words is "twenty-one trillion, one hundred sixteen billion, twenty-one million, two hundred thousand, four hundred thirty-six".