21500111347054 has 8 divisors (see below), whose sum is σ = 32329018285920. Its totient is φ = 10723771918416.

The previous prime is 21500111347007. The next prime is 21500111347063. The reversal of 21500111347054 is 45074311100512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13141876534 + ... + 13141878169.

It is an arithmetic number, because the mean of its divisors is an integer number (4041127285740).

Almost surely, 2^{21500111347054} is an apocalyptic number.

21500111347054 is a deficient number, since it is larger than the sum of its proper divisors (10828906938866).

21500111347054 is a wasteful number, since it uses less digits than its factorization.

21500111347054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26283755114.

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 21500111347054 its reverse (45074311100512), we get a palindrome (66574422447566).

The spelling of 21500111347054 in words is "twenty-one trillion, five hundred billion, one hundred eleven million, three hundred forty-seven thousand, fifty-four".