21040423000 has 64 divisors (see below), whose sum is σ = 51375280320. Its totient is φ = 8050240000.

The previous prime is 21040422973. The next prime is 21040423003. The reversal of 21040423000 is 32404012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040423003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434401 + ... + 480400.

It is an arithmetic number, because the mean of its divisors is an integer number (802738755).

Almost surely, 2^21040423000 is an apocalyptic number.

21040423000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040423000 is an abundant number, since it is smaller than the sum of its proper divisors (30334857320).

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

21040423000 is a wasteful number, since it uses less digits than its factorization.

21040423000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914845 (or 914831 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21040423000 its reverse (32404012), we get a palindrome (21072827012).

The spelling of 21040423000 in words is "twenty-one billion, forty million, four hundred twenty-three thousand".