21022405876 has 12 divisors (see below), whose sum is σ = 37412756640. Its totient is φ = 10333046840.

The previous prime is 21022405867. The next prime is 21022405879. The reversal of 21022405876 is 67850422012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022405879) 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, 44538760 + ... + 44539231.

It is an arithmetic number, because the mean of its divisors is an integer number (3117729720).

Almost surely, 2^21022405876 is an apocalyptic number.

It is an amenable number.

21022405876 is a deficient number, since it is larger than the sum of its proper divisors (16390350764).

21022405876 is a wasteful number, since it uses less digits than its factorization.

21022405876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89078054 (or 89078052 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

Adding to 21022405876 its reverse (67850422012), we get a palindrome (88872827888).

The spelling of 21022405876 in words is "twenty-one billion, twenty-two million, four hundred five thousand, eight hundred seventy-six".