20421200343 has 16 divisors (see below), whose sum is σ = 29109839616. Its totient is φ = 12688897920.

The previous prime is 20421200339. The next prime is 20421200347. The reversal of 20421200343 is 34300212402.

It is an interprime number because it is at equal distance from previous prime (20421200339) and next prime (20421200347).

It is not a de Polignac number, because 20421200343 - 2² = 20421200339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421200347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1938513 + ... + 1949018.

It is an arithmetic number, because the mean of its divisors is an integer number (1819364976).

Almost surely, 2^20421200343 is an apocalyptic number.

20421200343 is a deficient number, since it is larger than the sum of its proper divisors (8688639273).

20421200343 is a wasteful number, since it uses less digits than its factorization.

20421200343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887654.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20421200343 its reverse (34300212402), we get a palindrome (54721412745).

The spelling of 20421200343 in words is "twenty billion, four hundred twenty-one million, two hundred thousand, three hundred forty-three".