21004131026 has 8 divisors (see below), whose sum is σ = 31688313804. Its totient is φ = 10441359760.

The previous prime is 21004131017. The next prime is 21004131041. The reversal of 21004131026 is 62013140012.

It can be written as a sum of positive squares in 2 ways, for example, as 16400644225 + 4603486801 = 128065^2 + 67849^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21004130989 and 21004131007.

It is an unprimeable number.

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, 30352445 + ... + 30353136.

Almost surely, 2^21004131026 is an apocalyptic number.

21004131026 is a deficient number, since it is larger than the sum of its proper divisors (10684182778).

21004131026 is a wasteful number, since it uses less digits than its factorization.

21004131026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60705756.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21004131026 its reverse (62013140012), we get a palindrome (83017271038).

The spelling of 21004131026 in words is "twenty-one billion, four million, one hundred thirty-one thousand, twenty-six".