829812901621 has 4 divisors (see below), whose sum is σ = 905250438144. Its totient is φ = 754375365100.

The previous prime is 829812901601. The next prime is 829812901667. The reversal of 829812901621 is 126109218928.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 829812901621 - 2⁷ = 829812901493 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (829812901601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37718768245 + ... + 37718768266.

It is an arithmetic number, because the mean of its divisors is an integer number (226312609536).

Almost surely, 2^829812901621 is an apocalyptic number.

It is an amenable number.

829812901621 is a deficient number, since it is larger than the sum of its proper divisors (75437536523).

829812901621 is a wasteful number, since it uses less digits than its factorization.

829812901621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75437536522.

The product of its (nonzero) digits is 248832, while the sum is 49.

The spelling of 829812901621 in words is "eight hundred twenty-nine billion, eight hundred twelve million, nine hundred one thousand, six hundred twenty-one".