21426124040 has 32 divisors (see below), whose sum is σ = 48819024000. Its totient is φ = 8461961664.

The previous prime is 21426124033. The next prime is 21426124121. The reversal of 21426124040 is 4042162412.

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, 3387050 + ... + 3393369.

It is an arithmetic number, because the mean of its divisors is an integer number (1525594500).

Almost surely, 2^21426124040 is an apocalyptic number.

21426124040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21426124040 is an abundant number, since it is smaller than the sum of its proper divisors (27392899960).

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

21426124040 is a wasteful number, since it uses less digits than its factorization.

21426124040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780509 (or 6780505 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21426124040 its reverse (4042162412), we get a palindrome (25468286452).

The spelling of 21426124040 in words is "twenty-one billion, four hundred twenty-six million, one hundred twenty-four thousand, forty".