21343121001 has 40 divisors (see below), whose sum is σ = 32478800640. Its totient is φ = 13965291648.

The previous prime is 21343120991. The next prime is 21343121011. The reversal of 21343121001 is 10012134312.

21343121001 is a `hidden beast` number, since 21 + 3 + 431 + 210 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21343120991) and next prime (21343121011).

It is not a de Polignac number, because 21343121001 - 2¹³ = 21343112809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21343121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 931440 + ... + 954078.

It is an arithmetic number, because the mean of its divisors is an integer number (811970016).

Almost surely, 2^21343121001 is an apocalyptic number.

It is an amenable number.

21343121001 is a deficient number, since it is larger than the sum of its proper divisors (11135679639).

21343121001 is a wasteful number, since it uses less digits than its factorization.

21343121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22867 (or 22858 counting only the distinct ones).

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

Adding to 21343121001 its reverse (10012134312), we get a palindrome (31355255313).

It can be divided in two parts, 2134312 and 1001, that multiplied together give a palindrome (2136446312).

The spelling of 21343121001 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-one thousand, one".