21424132401 has 16 divisors (see below), whose sum is σ = 32648546304. Its totient is φ = 12241517904.

The previous prime is 21424132399. The next prime is 21424132403. The reversal of 21424132401 is 10423142412.

It is an interprime number because it is at equal distance from previous prime (21424132399) and next prime (21424132403).

It is not a de Polignac number, because 21424132401 - 2¹ = 21424132399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21424132403) 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 15 ways as a sum of consecutive naturals, for example, 405240 + ... + 455046.

It is an arithmetic number, because the mean of its divisors is an integer number (2040534144).

Almost surely, 2^21424132401 is an apocalyptic number.

21424132401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21424132401 is a deficient number, since it is larger than the sum of its proper divisors (11224413903).

21424132401 is a wasteful number, since it uses less digits than its factorization.

21424132401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70300.

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

Adding to 21424132401 its reverse (10423142412), we get a palindrome (31847274813).

It can be divided in two parts, 214241 and 32401, that added together give a palindrome (246642).

The spelling of 21424132401 in words is "twenty-one billion, four hundred twenty-four million, one hundred thirty-two thousand, four hundred one".