21432131001 has 6 divisors (see below), whose sum is σ = 30957522570. Its totient is φ = 14288087328.

The previous prime is 21432130981. The next prime is 21432131011. The reversal of 21432131001 is 10013123412.

It can be written as a sum of positive squares in only one way, i.e., 17151831225 + 4280299776 = 130965^2 + 65424^2 .

It is not a de Polignac number, because 21432131001 - 2⁵ = 21432130969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21432131011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1190673936 + ... + 1190673953.

It is an arithmetic number, because the mean of its divisors is an integer number (5159587095).

Almost surely, 2^21432131001 is an apocalyptic number.

It is an amenable number.

21432131001 is a deficient number, since it is larger than the sum of its proper divisors (9525391569).

21432131001 is a wasteful number, since it uses less digits than its factorization.

21432131001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381347895 (or 2381347892 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21432131001 its reverse (10013123412), we get a palindrome (31445254413).

The spelling of 21432131001 in words is "twenty-one billion, four hundred thirty-two million, one hundred thirty-one thousand, one".