21013434404 has 6 divisors (see below), whose sum is σ = 36773510214. Its totient is φ = 10506717200.

The previous prime is 21013434361. The next prime is 21013434419. The reversal of 21013434404 is 40443431012.

It can be written as a sum of positive squares in only one way, i.e., 19121358400 + 1892076004 = 138280^2 + 43498^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626679297 + ... + 2626679304.

It is an arithmetic number, because the mean of its divisors is an integer number (6128918369).

Almost surely, 2^21013434404 is an apocalyptic number.

It is an amenable number.

21013434404 is a deficient number, since it is larger than the sum of its proper divisors (15760075810).

21013434404 is a wasteful number, since it uses less digits than its factorization.

21013434404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253358605 (or 5253358603 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21013434404 its reverse (40443431012), we get a palindrome (61456865416).

The spelling of 21013434404 in words is "twenty-one billion, thirteen million, four hundred thirty-four thousand, four hundred four".