21435312124201 has 4 divisors (see below), whose sum is σ = 21466696183632. Its totient is φ = 21403928064772.

The previous prime is 21435312124183. The next prime is 21435312124207. The reversal of 21435312124201 is 10242121353412.

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.

It is a cyclic number.

It is not a de Polignac number, because 21435312124201 - 2¹⁵ = 21435312091433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21435312124207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15692028691 + ... + 15692030056.

It is an arithmetic number, because the mean of its divisors is an integer number (5366674045908).

Almost surely, 2^{21435312124201} is an apocalyptic number.

It is an amenable number.

21435312124201 is a deficient number, since it is larger than the sum of its proper divisors (31384059431).

21435312124201 is an equidigital number, since it uses as much as digits as its factorization.

21435312124201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31384059430.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 21435312124201 its reverse (10242121353412), we get a palindrome (31677433477613).

The spelling of 21435312124201 in words is "twenty-one trillion, four hundred thirty-five billion, three hundred twelve million, one hundred twenty-four thousand, two hundred one".