20421156600343 has 4 divisors (see below), whose sum is σ = 20452050937768. Its totient is φ = 20390262262920.

The previous prime is 20421156600331. The next prime is 20421156600421. The reversal of 20421156600343 is 34300665112402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20421156600343 - 2⁵ = 20421156600311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421156600323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15447167721 + ... + 15447169042.

It is an arithmetic number, because the mean of its divisors is an integer number (5113012734442).

Almost surely, 2^{20421156600343} is an apocalyptic number.

20421156600343 is a deficient number, since it is larger than the sum of its proper divisors (30894337425).

20421156600343 is an equidigital number, since it uses as much as digits as its factorization.

20421156600343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30894337424.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 20421156600343 in words is "twenty trillion, four hundred twenty-one billion, one hundred fifty-six million, six hundred thousand, three hundred forty-three".