21131004001 has 8 divisors (see below), whose sum is σ = 21232216640. Its totient is φ = 21029971248.

The previous prime is 21131003989. The next prime is 21131004007. The reversal of 21131004001 is 10040013112.

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 21131004001 - 2¹¹ = 21131001953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131004007) 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, 193540 + ... + 282346.

It is an arithmetic number, because the mean of its divisors is an integer number (2654027080).

Almost surely, 2^21131004001 is an apocalyptic number.

It is an amenable number.

21131004001 is a deficient number, since it is larger than the sum of its proper divisors (101212639).

21131004001 is an equidigital number, since it uses as much as digits as its factorization.

21131004001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89943.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21131004001 its reverse (10040013112), we get a palindrome (31171017113).

The spelling of 21131004001 in words is "twenty-one billion, one hundred thirty-one million, four thousand, one".