21434021031 has 4 divisors (see below), whose sum is σ = 28578694712. Its totient is φ = 14289347352.

The previous prime is 21434021029. The next prime is 21434021051. The reversal of 21434021031 is 13012043412.

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

It is not a de Polignac number, because 21434021031 - 2¹ = 21434021029 is a prime.

It is a super-2 number, since 2×21434021031² (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 = 21434020989 and 21434021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572336836 + ... + 3572336841.

It is an arithmetic number, because the mean of its divisors is an integer number (7144673678).

Almost surely, 2^21434021031 is an apocalyptic number.

21434021031 is a deficient number, since it is larger than the sum of its proper divisors (7144673681).

21434021031 is an equidigital number, since it uses as much as digits as its factorization.

21434021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144673680.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21434021031 its reverse (13012043412), we get a palindrome (34446064443).

The spelling of 21434021031 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, thirty-one".