21000141005 has 4 divisors (see below), whose sum is σ = 25200169212. Its totient is φ = 16800112800.

The previous prime is 21000140999. The next prime is 21000141067. The reversal of 21000141005 is 50014100012.

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 15114489481 + 5885651524 = 122941^2 + 76718^2 .

It is not a de Polignac number, because 21000141005 - 2²⁸ = 20731705549 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2100014096 + ... + 2100014105.

It is an arithmetic number, because the mean of its divisors is an integer number (6300042303).

Almost surely, 2^21000141005 is an apocalyptic number.

It is an amenable number.

21000141005 is a deficient number, since it is larger than the sum of its proper divisors (4200028207).

21000141005 is an equidigital number, since it uses as much as digits as its factorization.

21000141005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200028206.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 21000141005 its reverse (50014100012), we get a palindrome (71014241017).

The spelling of 21000141005 in words is "twenty-one billion, one hundred forty-one thousand, five".