21420031034 has 16 divisors (see below), whose sum is σ = 32656041000. Its totient is φ = 10535906304.

The previous prime is 21420031001. The next prime is 21420031057. The reversal of 21420031034 is 43013002412.

It can be written as a sum of positive squares in 4 ways, for example, as 21399301225 + 20729809 = 146285^2 + 4553^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21420030997 and 21420031015.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270359 + ... + 340490.

Almost surely, 2^21420031034 is an apocalyptic number.

21420031034 is a deficient number, since it is larger than the sum of its proper divisors (11236009966).

21420031034 is a wasteful number, since it uses less digits than its factorization.

21420031034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611137.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21420031034 its reverse (43013002412), we get a palindrome (64433033446).

The spelling of 21420031034 in words is "twenty-one billion, four hundred twenty million, thirty-one thousand, thirty-four".