21010140404 has 72 divisors (see below), whose sum is σ = 42845982984. Its totient is φ = 8976844800.

The previous prime is 21010140367. The next prime is 21010140419. The reversal of 21010140404 is 40404101012.

It can be written as a sum of positive squares in 4 ways, for example, as 12638256400 + 8371884004 = 112420^2 + 91498^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10868222 + ... + 10870154.

It is an arithmetic number, because the mean of its divisors is an integer number (595083097).

Almost surely, 2^21010140404 is an apocalyptic number.

It is an amenable number.

21010140404 is an abundant number, since it is smaller than the sum of its proper divisors (21835842580).

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

21010140404 is a wasteful number, since it uses less digits than its factorization.

21010140404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297 (or 3284 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21010140404 its reverse (40404101012), we get a palindrome (61414241416).

The spelling of 21010140404 in words is "twenty-one billion, ten million, one hundred forty thousand, four hundred four".