21130031404 has 24 divisors (see below), whose sum is σ = 39125446640. Its totient is φ = 9957095424.

The previous prime is 21130031399. The next prime is 21130031407. The reversal of 21130031404 is 40413003112.

It is a super-2 number, since 2×21130031404² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21130031407) 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, 705609 + ... + 734944.

Almost surely, 2^21130031404 is an apocalyptic number.

It is an amenable number.

21130031404 is a deficient number, since it is larger than the sum of its proper divisors (17995415236).

21130031404 is a wasteful number, since it uses less digits than its factorization.

21130031404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440769 (or 1440767 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21130031404 its reverse (40413003112), we get a palindrome (61543034516).

The spelling of 21130031404 in words is "twenty-one billion, one hundred thirty million, thirty-one thousand, four hundred four".