20424131421 has 16 divisors (see below), whose sum is σ = 27703118400. Its totient is φ = 13380772608.

The previous prime is 20424131309. The next prime is 20424131437. The reversal of 20424131421 is 12413142402.

It is not a de Polignac number, because 20424131421 - 2²³ = 20415742813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20424131391 and 20424131400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424131621) 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, 551475 + ... + 587343.

It is an arithmetic number, because the mean of its divisors is an integer number (1731444900).

Almost surely, 2^20424131421 is an apocalyptic number.

It is an amenable number.

20424131421 is a deficient number, since it is larger than the sum of its proper divisors (7278986979).

20424131421 is a wasteful number, since it uses less digits than its factorization.

20424131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39148.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 20424131421 its reverse (12413142402), we get a palindrome (32837273823).

The spelling of 20424131421 in words is "twenty billion, four hundred twenty-four million, one hundred thirty-one thousand, four hundred twenty-one".