21130501646 has 8 divisors (see below), whose sum is σ = 31720007160. Its totient is φ = 10557165928.

The previous prime is 21130501633. The next prime is 21130501661. The reversal of 21130501646 is 64610503112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4039181 + ... + 4044408.

It is an arithmetic number, because the mean of its divisors is an integer number (3965000895).

Almost surely, 2^21130501646 is an apocalyptic number.

21130501646 is a deficient number, since it is larger than the sum of its proper divisors (10589505514).

21130501646 is a wasteful number, since it uses less digits than its factorization.

21130501646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8084898.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21130501646 in words is "twenty-one billion, one hundred thirty million, five hundred one thousand, six hundred forty-six".