21504151505412 has 96 divisors (see below), whose sum is σ = 57125084163840. Its totient is φ = 6991531741440.

The previous prime is 21504151505383. The next prime is 21504151505489. The reversal of 21504151505412 is 21450515140512.

21504151505412 is a `hidden beast` number, since 2 + 1 + 50 + 4 + 15 + 1 + 50 + 541 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17823073 + ... + 18991319.

It is an arithmetic number, because the mean of its divisors is an integer number (595052960040).

Almost surely, 2^{21504151505412} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21504151505412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28562542081920).

21504151505412 is an abundant number, since it is smaller than the sum of its proper divisors (35620932658428).

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

21504151505412 is a wasteful number, since it uses less digits than its factorization.

21504151505412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172458 (or 1172450 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

Adding to 21504151505412 its reverse (21450515140512), we get a palindrome (42954666645924).

The spelling of 21504151505412 in words is "twenty-one trillion, five hundred four billion, one hundred fifty-one million, five hundred five thousand, four hundred twelve".