21641404134 has 16 divisors (see below), whose sum is σ = 49466066688. Its totient is φ = 6183258312.

The previous prime is 21641404097. The next prime is 21641404151. The reversal of 21641404134 is 43140414612.

It is a super-2 number, since 2×21641404134² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257635722 + ... + 257635805.

It is an arithmetic number, because the mean of its divisors is an integer number (3091629168).

Almost surely, 2^21641404134 is an apocalyptic number.

21641404134 is an abundant number, since it is smaller than the sum of its proper divisors (27824662554).

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

21641404134 is a wasteful number, since it uses less digits than its factorization.

21641404134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515271539.

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21641404134 its reverse (43140414612), we get a palindrome (64781818746).

The spelling of 21641404134 in words is "twenty-one billion, six hundred forty-one million, four hundred four thousand, one hundred thirty-four".