20534322421 has 4 divisors (see below), whose sum is σ = 21427119072. Its totient is φ = 19641525772.

The previous prime is 20534322401. The next prime is 20534322433. The reversal of 20534322421 is 12422343502.

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 a cyclic number.

It is not a de Polignac number, because 20534322421 - 2³¹ = 18386838773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20534322421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534322401) 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, 446398291 + ... + 446398336.

It is an arithmetic number, because the mean of its divisors is an integer number (5356779768).

Almost surely, 2^20534322421 is an apocalyptic number.

It is an amenable number.

20534322421 is a deficient number, since it is larger than the sum of its proper divisors (892796651).

20534322421 is an equidigital number, since it uses as much as digits as its factorization.

20534322421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892796650.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 20534322421 its reverse (12422343502), we get a palindrome (32956665923).

The spelling of 20534322421 in words is "twenty billion, five hundred thirty-four million, three hundred twenty-two thousand, four hundred twenty-one".