21015430533200 has 60 divisors (see below), whose sum is σ = 50548349832480. Its totient is φ = 8396386078080.

The previous prime is 21015430533103. The next prime is 21015430533247. The reversal of 21015430533200 is 233503451012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30237644 + ... + 30924843.

It is an arithmetic number, because the mean of its divisors is an integer number (842472497208).

Almost surely, 2^{21015430533200} is an apocalyptic number.

21015430533200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21015430533200 is an abundant number, since it is smaller than the sum of its proper divisors (29532919299280).

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

21015430533200 is a wasteful number, since it uses less digits than its factorization.

21015430533200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61163364 (or 61163353 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21015430533200 its reverse (233503451012), we get a palindrome (21248933984212).

The spelling of 21015430533200 in words is "twenty-one trillion, fifteen billion, four hundred thirty million, five hundred thirty-three thousand, two hundred".