21230442040 has 32 divisors (see below), whose sum is σ = 47779476480. Its totient is φ = 8490224512.

The previous prime is 21230442017. The next prime is 21230442049. The reversal of 21230442040 is 4024403212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230442049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121929 + ... + 239431.

It is an arithmetic number, because the mean of its divisors is an integer number (1493108640).

Almost surely, 2^21230442040 is an apocalyptic number.

21230442040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230442040 is an abundant number, since it is smaller than the sum of its proper divisors (26549034440).

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

21230442040 is a wasteful number, since it uses less digits than its factorization.

21230442040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122031 (or 122027 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21230442040 its reverse (4024403212), we get a palindrome (25254845252).

The spelling of 21230442040 in words is "twenty-one billion, two hundred thirty million, four hundred forty-two thousand, forty".