21214321043 has 4 divisors (see below), whose sum is σ = 21293184960. Its totient is φ = 21135457128.

The previous prime is 21214321027. The next prime is 21214321057. The reversal of 21214321043 is 34012341212.

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 21214321043 - 2⁴ = 21214321027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214321003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39431555 + ... + 39432092.

It is an arithmetic number, because the mean of its divisors is an integer number (5323296240).

Almost surely, 2^21214321043 is an apocalyptic number.

21214321043 is a deficient number, since it is larger than the sum of its proper divisors (78863917).

21214321043 is an equidigital number, since it uses as much as digits as its factorization.

21214321043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78863916.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21214321043 its reverse (34012341212), we get a palindrome (55226662255).

The spelling of 21214321043 in words is "twenty-one billion, two hundred fourteen million, three hundred twenty-one thousand, forty-three".