21000104431026 has 64 divisors (see below), whose sum is σ = 48806838662400. Its totient is φ = 5899284322560.

The previous prime is 21000104430983. The next prime is 21000104431049. The reversal of 21000104431026 is 62013440100012.

It is a super-2 number, since 2×21000104431026² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000104430987 and 21000104431005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4691500 + ... + 8000648.

It is an arithmetic number, because the mean of its divisors is an integer number (762606854100).

Almost surely, 2^{21000104431026} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000104431026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24403419331200).

21000104431026 is an abundant number, since it is smaller than the sum of its proper divisors (27806734231374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000104431026 is a wasteful number, since it uses less digits than its factorization.

21000104431026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311699.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21000104431026 its reverse (62013440100012), we get a palindrome (83013544531038).

The spelling of 21000104431026 in words is "twenty-one trillion, one hundred four million, four hundred thirty-one thousand, twenty-six".