21004144131 has 8 divisors (see below), whose sum is σ = 28152152064. Its totient is φ = 13929449480.

The previous prime is 21004144093. The next prime is 21004144229. The reversal of 21004144131 is 13144140012.

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 21004144131 - 2¹³ = 21004135939 is a prime.

It is a super-2 number, since 2×21004144131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21004144098 and 21004144107.

It is not an unprimeable number, because it can be changed into a prime (21004143131) 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, 18327651 + ... + 18328796.

It is an arithmetic number, because the mean of its divisors is an integer number (3519019008).

Almost surely, 2^21004144131 is an apocalyptic number.

21004144131 is a deficient number, since it is larger than the sum of its proper divisors (7148007933).

21004144131 is a wasteful number, since it uses less digits than its factorization.

21004144131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36656641.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21004144131 its reverse (13144140012), we get a palindrome (34148284143).

The spelling of 21004144131 in words is "twenty-one billion, four million, one hundred forty-four thousand, one hundred thirty-one".