21034213434 has 64 divisors (see below), whose sum is σ = 51962158080. Its totient is φ = 6263282880.

The previous prime is 21034213433. The next prime is 21034213469. The reversal of 21034213434 is 43431243012.

21034213434 is a `hidden beast` number, since 2 + 10 + 3 + 4 + 213 + 434 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21034213398 and 21034213407.

It is not an unprimeable number, because it can be changed into a prime (21034213433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 461517 + ... + 505040.

It is an arithmetic number, because the mean of its divisors is an integer number (811908720).

Almost surely, 2^21034213434 is an apocalyptic number.

21034213434 is an abundant number, since it is smaller than the sum of its proper divisors (30927944646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21034213434 is a wasteful number, since it uses less digits than its factorization.

21034213434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966612 (or 966606 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21034213434 its reverse (43431243012), we get a palindrome (64465456446).

The spelling of 21034213434 in words is "twenty-one billion, thirty-four million, two hundred thirteen thousand, four hundred thirty-four".