21434343031 has 8 divisors (see below), whose sum is σ = 21572071280. Its totient is φ = 21296691072.

The previous prime is 21434343017. The next prime is 21434343043. The reversal of 21434343031 is 13034343412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21434343031 - 2²⁹ = 20897472119 is a prime.

It is a super-2 number, since 2×21434343031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434373031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610975 + ... + 645103.

It is an arithmetic number, because the mean of its divisors is an integer number (2696508910).

Almost surely, 2^21434343031 is an apocalyptic number.

21434343031 is a deficient number, since it is larger than the sum of its proper divisors (137728249).

21434343031 is a wasteful number, since it uses less digits than its factorization.

21434343031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38145.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21434343031 its reverse (13034343412), we get a palindrome (34468686443).

The spelling of 21434343031 in words is "twenty-one billion, four hundred thirty-four million, three hundred forty-three thousand, thirty-one".