21430501145 has 4 divisors (see below), whose sum is σ = 25716601380. Its totient is φ = 17144400912.

The previous prime is 21430501139. The next prime is 21430501181. The reversal of 21430501145 is 54110503412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4354284169 + 17076216976 = 65987^2 + 130676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21430501145 - 2⁴ = 21430501129 is a prime.

It is a super-2 number, since 2×21430501145² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2143050110 + ... + 2143050119.

It is an arithmetic number, because the mean of its divisors is an integer number (6429150345).

Almost surely, 2^21430501145 is an apocalyptic number.

It is an amenable number.

21430501145 is a deficient number, since it is larger than the sum of its proper divisors (4286100235).

21430501145 is an equidigital number, since it uses as much as digits as its factorization.

21430501145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286100234.

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 21430501145 in words is "twenty-one billion, four hundred thirty million, five hundred one thousand, one hundred forty-five".