21140402224 has 80 divisors (see below), whose sum is σ = 44917410816. Its totient is φ = 9599206400.

The previous prime is 21140402221. The next prime is 21140402233. The reversal of 21140402224 is 42220404112.

It is a junction number, because it is equal to n+sod(n) for n = 21140402195 and 21140402204.

It is not an unprimeable number, because it can be changed into a prime (21140402221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896019 + ... + 919309.

Almost surely, 2^21140402224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21140402224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22458705408).

21140402224 is an abundant number, since it is smaller than the sum of its proper divisors (23777008592).

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

21140402224 is a wasteful number, since it uses less digits than its factorization.

21140402224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23434 (or 23428 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21140402224 its reverse (42220404112), we get a palindrome (63360806336).

The spelling of 21140402224 in words is "twenty-one billion, one hundred forty million, four hundred two thousand, two hundred twenty-four".