21145054305 has 32 divisors (see below), whose sum is σ = 35811763200. Its totient is φ = 10624105152.

The previous prime is 21145054303. The next prime is 21145054319. The reversal of 21145054305 is 50345054112.

It is not a de Polignac number, because 21145054305 - 2¹ = 21145054303 is a prime.

It is a super-2 number, since 2×21145054305² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21145054303) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 156229 + ... + 258258.

It is an arithmetic number, because the mean of its divisors is an integer number (1119117600).

Almost surely, 2^21145054305 is an apocalyptic number.

It is an amenable number.

21145054305 is a deficient number, since it is larger than the sum of its proper divisors (14666708895).

21145054305 is a wasteful number, since it uses less digits than its factorization.

21145054305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414693.

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21145054305 in words is "twenty-one billion, one hundred forty-five million, fifty-four thousand, three hundred five".