21002135005 has 16 divisors (see below), whose sum is σ = 25528608000. Its totient is φ = 16584979840.

The previous prime is 21002134999. The next prime is 21002135009. The reversal of 21002135005 is 50053120012.

It is not a de Polignac number, because 21002135005 - 2⁵ = 21002134973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002135009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227160 + ... + 305950.

It is an arithmetic number, because the mean of its divisors is an integer number (1595538000).

Almost surely, 2^21002135005 is an apocalyptic number.

It is an amenable number.

21002135005 is a deficient number, since it is larger than the sum of its proper divisors (4526472995).

21002135005 is an equidigital number, since it uses as much as digits as its factorization.

21002135005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79484.

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 21002135005 its reverse (50053120012), we get a palindrome (71055255017).

The spelling of 21002135005 in words is "twenty-one billion, two million, one hundred thirty-five thousand, five".