21054131252176 has 80 divisors (see below), whose sum is σ = 45451938032640. Its totient is φ = 9365547847040.

The previous prime is 21054131252131. The next prime is 21054131252177. The reversal of 21054131252176 is 67125213145012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054131252177) 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, 90702375 + ... + 90934201.

It is an arithmetic number, because the mean of its divisors is an integer number (568149225408).

Almost surely, 2^{21054131252176} 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 21054131252176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22725969016320).

21054131252176 is an abundant number, since it is smaller than the sum of its proper divisors (24397806780464).

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

21054131252176 is a wasteful number, since it uses less digits than its factorization.

21054131252176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242872 (or 242866 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

Adding to 21054131252176 its reverse (67125213145012), we get a palindrome (88179344397188).

The spelling of 21054131252176 in words is "twenty-one trillion, fifty-four billion, one hundred thirty-one million, two hundred fifty-two thousand, one hundred seventy-six".