21002131301 has 4 divisors (see below), whose sum is σ = 21018400704. Its totient is φ = 20985861900.

The previous prime is 21002131291. The next prime is 21002131331. The reversal of 21002131301 is 10313120012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002131301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002131331) by changing a digit.

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, 8132765 + ... + 8135346.

It is an arithmetic number, because the mean of its divisors is an integer number (5254600176).

Almost surely, 2^21002131301 is an apocalyptic number.

It is an amenable number.

21002131301 is a deficient number, since it is larger than the sum of its proper divisors (16269403).

21002131301 is a wasteful number, since it uses less digits than its factorization.

21002131301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16269402.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21002131301 its reverse (10313120012), we get a palindrome (31315251313).

The spelling of 21002131301 in words is "twenty-one billion, two million, one hundred thirty-one thousand, three hundred one".