21002131003 has 8 divisors (see below), whose sum is σ = 24014531072. Its totient is φ = 17992754856.

The previous prime is 21002130983. The next prime is 21002131103. The reversal of 21002131003 is 30013120012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002131003 - 2¹³ = 21002122811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002131103) 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 7 ways as a sum of consecutive naturals, for example, 741075 + ... + 768892.

It is an arithmetic number, because the mean of its divisors is an integer number (3001816384).

Almost surely, 2^21002131003 is an apocalyptic number.

21002131003 is a deficient number, since it is larger than the sum of its proper divisors (3012400069).

21002131003 is a wasteful number, since it uses less digits than its factorization.

21002131003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511961.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21002131003 its reverse (30013120012), we get a palindrome (51015251015).

The spelling of 21002131003 in words is "twenty-one billion, two million, one hundred thirty-one thousand, three".