21004000131 has 16 divisors (see below), whose sum is σ = 29702027520. Its totient is φ = 13174281120.

The previous prime is 21004000103. The next prime is 21004000133. The reversal of 21004000131 is 13100040012.

It is a happy number.

It is not a de Polignac number, because 21004000131 - 2⁹ = 21003999619 is a prime.

It is a super-2 number, since 2×21004000131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21004000133) 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, 2490921 + ... + 2499338.

It is an arithmetic number, because the mean of its divisors is an integer number (1856376720).

Almost surely, 2^21004000131 is an apocalyptic number.

21004000131 is a deficient number, since it is larger than the sum of its proper divisors (8698027389).

21004000131 is a wasteful number, since it uses less digits than its factorization.

21004000131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990346.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21004000131 its reverse (13100040012), we get a palindrome (34104040143).

The spelling of 21004000131 in words is "twenty-one billion, four million, one hundred thirty-one", and thus it is an aban number.