21054531445 has 16 divisors (see below), whose sum is σ = 25405733232. Its totient is φ = 16750356480.

The previous prime is 21054531439. The next prime is 21054531457. The reversal of 21054531445 is 54413545012.

It can be written as a sum of positive squares in 8 ways, for example, as 2698075249 + 18356456196 = 51943^2 + 135486^2 .

It is not a de Polignac number, because 21054531445 - 2¹⁵ = 21054498677 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21054531445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642355 + ... + 674335.

It is an arithmetic number, because the mean of its divisors is an integer number (1587858327).

Almost surely, 2^21054531445 is an apocalyptic number.

It is an amenable number.

21054531445 is a deficient number, since it is larger than the sum of its proper divisors (4351201787).

21054531445 is a wasteful number, since it uses less digits than its factorization.

21054531445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32712.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 21054531445 in words is "twenty-one billion, fifty-four million, five hundred thirty-one thousand, four hundred forty-five".