21002140345 has 8 divisors (see below), whose sum is σ = 25485743880. Its totient is φ = 16612928640.

The previous prime is 21002140343. The next prime is 21002140399. The reversal of 21002140345 is 54304120012.

It can be written as a sum of positive squares in 4 ways, for example, as 4784627241 + 16217513104 = 69171^2 + 127348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21002140345 - 2¹ = 21002140343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002140343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23597466 + ... + 23598355.

It is an arithmetic number, because the mean of its divisors is an integer number (3185717985).

Almost surely, 2^21002140345 is an apocalyptic number.

It is an amenable number.

21002140345 is a deficient number, since it is larger than the sum of its proper divisors (4483603535).

21002140345 is an equidigital number, since it uses as much as digits as its factorization.

21002140345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47195915.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21002140345 its reverse (54304120012), we get a palindrome (75306260357).

The spelling of 21002140345 in words is "twenty-one billion, two million, one hundred forty thousand, three hundred forty-five".