21055000032 has 480 divisors, whose sum is σ = 71430315264. Its totient is φ = 6021734400.

The previous prime is 21054999997. The next prime is 21055000033. The reversal of 21055000032 is 23000055012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21054999969 and 21055000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055000033) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 63610107 + ... + 63610437.

Almost surely, 2^21055000032 is an apocalyptic number.

21055000032 is a gapful number since it is divisible by the number (22) 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 21055000032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35715157632).

21055000032 is an abundant number, since it is smaller than the sum of its proper divisors (50375315232).

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

21055000032 is a wasteful number, since it uses less digits than its factorization.

21055000032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

Adding to 21055000032 its reverse (23000055012), we get a palindrome (44055055044).

The spelling of 21055000032 in words is "twenty-one billion, fifty-five million, thirty-two", and thus it is an aban number and an uban number.