20132400421 has 4 divisors (see below), whose sum is σ = 23008457632. Its totient is φ = 17256343212.

The previous prime is 20132400349. The next prime is 20132400439. The reversal of 20132400421 is 12400423102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12400423102 = 2 ⋅6200211551.

It is a cyclic number.

It is not a de Polignac number, because 20132400421 - 2⁹ = 20132399909 is a prime.

It is a super-2 number, since 2×20132400421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20132400451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438028595 + ... + 1438028608.

It is an arithmetic number, because the mean of its divisors is an integer number (5752114408).

Almost surely, 2^20132400421 is an apocalyptic number.

It is an amenable number.

20132400421 is a deficient number, since it is larger than the sum of its proper divisors (2876057211).

20132400421 is an equidigital number, since it uses as much as digits as its factorization.

20132400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876057210.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20132400421 its reverse (12400423102), we get a palindrome (32532823523).

The spelling of 20132400421 in words is "twenty billion, one hundred thirty-two million, four hundred thousand, four hundred twenty-one".