921798436669 has 4 divisors (see below), whose sum is σ = 1005598294560. Its totient is φ = 837998578780.

The previous prime is 921798436627. The next prime is 921798436673. The reversal of 921798436669 is 966634897129.

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 not a de Polignac number, because 921798436669 - 2¹³ = 921798428477 is a prime.

It is a super-2 number, since 2×921798436669² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921798436598 and 921798436607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921798436469) 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, 41899928929 + ... + 41899928950.

It is an arithmetic number, because the mean of its divisors is an integer number (251399573640).

Almost surely, 2^921798436669 is an apocalyptic number.

It is an amenable number.

921798436669 is a deficient number, since it is larger than the sum of its proper divisors (83799857891).

921798436669 is a wasteful number, since it uses less digits than its factorization.

921798436669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83799857890.

The product of its digits is 211631616, while the sum is 70.

The spelling of 921798436669 in words is "nine hundred twenty-one billion, seven hundred ninety-eight million, four hundred thirty-six thousand, six hundred sixty-nine".