21434202331 has 4 divisors (see below), whose sum is σ = 21435293464. Its totient is φ = 21433111200.

The previous prime is 21434202329. The next prime is 21434202337. The reversal of 21434202331 is 13320243412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21434202331 - 2¹ = 21434202329 is a prime.

It is a super-2 number, since 2×21434202331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21434202296 and 21434202305.

It is not an unprimeable number, because it can be changed into a prime (21434202337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515550 + ... + 555571.

It is an arithmetic number, because the mean of its divisors is an integer number (5358823366).

Almost surely, 2^21434202331 is an apocalyptic number.

21434202331 is a deficient number, since it is larger than the sum of its proper divisors (1091133).

21434202331 is a wasteful number, since it uses less digits than its factorization.

21434202331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091132.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21434202331 its reverse (13320243412), we get a palindrome (34754445743).

The spelling of 21434202331 in words is "twenty-one billion, four hundred thirty-four million, two hundred two thousand, three hundred thirty-one".