21145152145 has 16 divisors (see below), whose sum is σ = 27477030672. Its totient is φ = 15528602880.

The previous prime is 21145152137. The next prime is 21145152151. The reversal of 21145152145 is 54125154112.

It can be written as a sum of positive squares in 8 ways, for example, as 11941244176 + 9203907969 = 109276^2 + 95937^2 .

It is not a de Polignac number, because 21145152145 - 2³ = 21145152137 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 886882 + ... + 910411.

It is an arithmetic number, because the mean of its divisors is an integer number (1717314417).

Almost surely, 2^21145152145 is an apocalyptic number.

It is an amenable number.

21145152145 is a deficient number, since it is larger than the sum of its proper divisors (6331878527).

21145152145 is a wasteful number, since it uses less digits than its factorization.

21145152145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797492.

The product of its digits is 8000, while the sum is 31.

The spelling of 21145152145 in words is "twenty-one billion, one hundred forty-five million, one hundred fifty-two thousand, one hundred forty-five".