83427967921 has 3 divisors (see below), whose sum is σ = 83428256761. Its totient is φ = 83427679082.

The previous prime is 83427967849. The next prime is 83427967937. The reversal of 83427967921 is 12976972438.

The square root of 83427967921 is 288839.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12976972438 = 2 ⋅6488486219.

It is not a de Polignac number, because 83427967921 - 2⁷ = 83427967793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83427967621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 144420 + ... + 433258.

Almost surely, 2^83427967921 is an apocalyptic number.

83427967921 is the 288839-th square number.

83427967921 is the 144420-th centered octagonal number.

It is an amenable number.

83427967921 is a deficient number, since it is larger than the sum of its proper divisors (288840).

83427967921 is an frugal number, since it uses more digits than its factorization.

83427967921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577678 (or 288839 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 58.

The spelling of 83427967921 in words is "eighty-three billion, four hundred twenty-seven million, nine hundred sixty-seven thousand, nine hundred twenty-one".