21510510032 has 80 divisors (see below), whose sum is σ = 47460545664. Its totient is φ = 9357120000.

The previous prime is 21510510029. The next prime is 21510510037. The reversal of 21510510032 is 23001501512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21510509986 and 21510510013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510510037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370157 + ... + 424307.

Almost surely, 2^21510510032 is an apocalyptic number.

21510510032 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 21510510032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23730272832).

21510510032 is an abundant number, since it is smaller than the sum of its proper divisors (25950035632).

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

21510510032 is a wasteful number, since it uses less digits than its factorization.

21510510032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54268 (or 54262 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The spelling of 21510510032 in words is "twenty-one billion, five hundred ten million, five hundred ten thousand, thirty-two".