21500524122542 has 4 divisors (see below), whose sum is σ = 32250786183816. Its totient is φ = 10750262061270.

The previous prime is 21500524122541. The next prime is 21500524122551. The reversal of 21500524122542 is 24522142500512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500524122541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5375131030634 + ... + 5375131030637.

It is an arithmetic number, because the mean of its divisors is an integer number (8062696545954).

Almost surely, 2^{21500524122542} is an apocalyptic number.

21500524122542 is a deficient number, since it is larger than the sum of its proper divisors (10750262061274).

21500524122542 is a wasteful number, since it uses less digits than its factorization.

21500524122542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750262061273.

The product of its (nonzero) digits is 64000, while the sum is 35.

The spelling of 21500524122542 in words is "twenty-one trillion, five hundred billion, five hundred twenty-four million, one hundred twenty-two thousand, five hundred forty-two".