21802464136 has 16 divisors (see below), whose sum is σ = 40881738240. Its totient is φ = 10900667280.

The previous prime is 21802464121. The next prime is 21802464139. The reversal of 21802464136 is 63146420812.

It is a junction number, because it is equal to n+sod(n) for n = 21802464095 and 21802464104.

It is not an unprimeable number, because it can be changed into a prime (21802464139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125505 + ... + 243631.

It is an arithmetic number, because the mean of its divisors is an integer number (2555108640).

Almost surely, 2^21802464136 is an apocalyptic number.

It is an amenable number.

21802464136 is a deficient number, since it is larger than the sum of its proper divisors (19079274104).

21802464136 is a wasteful number, since it uses less digits than its factorization.

21802464136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141204 (or 141200 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

Adding to 21802464136 its reverse (63146420812), we get a palindrome (84948884948).

The spelling of 21802464136 in words is "twenty-one billion, eight hundred two million, four hundred sixty-four thousand, one hundred thirty-six".