21432031000 has 64 divisors (see below), whose sum is σ = 50259437280. Its totient is φ = 8554268800.

The previous prime is 21432030967. The next prime is 21432031001. The reversal of 21432031000 is 13023412.

It is a happy number.

It is a super-2 number, since 2×21432031000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432031001) 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, 444054 + ... + 489946.

Almost surely, 2^21432031000 is an apocalyptic number.

21432031000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21432031000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25129718640).

21432031000 is an abundant number, since it is smaller than the sum of its proper divisors (28827406280).

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

21432031000 is a wasteful number, since it uses less digits than its factorization.

21432031000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46381 (or 46367 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21432031000 its reverse (13023412), we get a palindrome (21445054412).

The spelling of 21432031000 in words is "twenty-one billion, four hundred thirty-two million, thirty-one thousand".