21054522745 has 8 divisors (see below), whose sum is σ = 25881657480. Its totient is φ = 16432798080.

The previous prime is 21054522739. The next prime is 21054522773. The reversal of 21054522745 is 54722545012.

It can be written as a sum of positive squares in 4 ways, for example, as 1806845049 + 19247677696 = 42507^2 + 138736^2 .

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

It is not a de Polignac number, because 21054522745 - 2⁹ = 21054522233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51352290 + ... + 51352699.

It is an arithmetic number, because the mean of its divisors is an integer number (3235207185).

Almost surely, 2^21054522745 is an apocalyptic number.

It is an amenable number.

21054522745 is a deficient number, since it is larger than the sum of its proper divisors (4827134735).

21054522745 is a wasteful number, since it uses less digits than its factorization.

21054522745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102705035.

The product of its (nonzero) digits is 112000, while the sum is 37.

The spelling of 21054522745 in words is "twenty-one billion, fifty-four million, five hundred twenty-two thousand, seven hundred forty-five".