21013406405164 has 48 divisors (see below), whose sum is σ = 37771091517600. Its totient is φ = 10225253376000.

The previous prime is 21013406405137. The next prime is 21013406405171. The reversal of 21013406405164 is 46150460431012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247112974 + ... + 247197994.

It is an arithmetic number, because the mean of its divisors is an integer number (786897739950).

Almost surely, 2^{21013406405164} is an apocalyptic number.

It is an amenable number.

21013406405164 is a deficient number, since it is larger than the sum of its proper divisors (16757685112436).

21013406405164 is a wasteful number, since it uses less digits than its factorization.

21013406405164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95554 (or 95552 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21013406405164 its reverse (46150460431012), we get a palindrome (67163866836176).

The spelling of 21013406405164 in words is "twenty-one trillion, thirteen billion, four hundred six million, four hundred five thousand, one hundred sixty-four".