21435052501001 has 6 divisors (see below), whose sum is σ = 21970610031006. Its totient is φ = 20912246340800.

The previous prime is 21435052500991. The next prime is 21435052501007. The reversal of 21435052501001 is 10010525053412.

It can be written as a sum of positive squares in 3 ways, for example, as 702329478601 + 20732723022400 = 838051^2 + 4553320^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21435052501001 is a prime.

It is a super-3 number, since 3×21435052501001³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21435052501007) 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, 6375683180 + ... + 6375686541.

It is an arithmetic number, because the mean of its divisors is an integer number (3661768338501).

Almost surely, 2^{21435052501001} is an apocalyptic number.

It is an amenable number.

21435052501001 is a deficient number, since it is larger than the sum of its proper divisors (535557530005).

21435052501001 is an equidigital number, since it uses as much as digits as its factorization.

21435052501001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12751369803 (or 12751369762 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 21435052501001 its reverse (10010525053412), we get a palindrome (31445577554413).

The spelling of 21435052501001 in words is "twenty-one trillion, four hundred thirty-five billion, fifty-two million, five hundred one thousand, one".