20421167943 has 48 divisors (see below), whose sum is σ = 30950857728. Its totient is φ = 11955187200.

The previous prime is 20421167927. The next prime is 20421167953. The reversal of 20421167943 is 34976112402.

It is not a de Polignac number, because 20421167943 - 2⁴ = 20421167927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421167953) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7684471 + ... + 7687127.

It is an arithmetic number, because the mean of its divisors is an integer number (644809536).

Almost surely, 2^20421167943 is an apocalyptic number.

20421167943 is a deficient number, since it is larger than the sum of its proper divisors (10529689785).

20421167943 is a wasteful number, since it uses less digits than its factorization.

20421167943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3396 (or 3385 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 20421167943 in words is "twenty billion, four hundred twenty-one million, one hundred sixty-seven thousand, nine hundred forty-three".