20423324421 has 16 divisors (see below), whose sum is σ = 31572289920. Its totient is φ = 13023568800.

The previous prime is 20423324407. The next prime is 20423324431. The reversal of 20423324421 is 12442332402.

20423324421 is a `hidden beast` number, since 2 + 0 + 4 + 233 + 2 + 4 + 421 = 666.

It is not a de Polignac number, because 20423324421 - 2⁷ = 20423324293 is a prime.

It is a super-2 number, since 2×20423324421² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423324431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16443280 + ... + 16444521.

It is an arithmetic number, because the mean of its divisors is an integer number (1973268120).

Almost surely, 2^20423324421 is an apocalyptic number.

It is an amenable number.

20423324421 is a deficient number, since it is larger than the sum of its proper divisors (11148965499).

20423324421 is a wasteful number, since it uses less digits than its factorization.

20423324421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32887833 (or 32887827 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20423324421 its reverse (12442332402), we get a palindrome (32865656823).

The spelling of 20423324421 in words is "twenty billion, four hundred twenty-three million, three hundred twenty-four thousand, four hundred twenty-one".