21211022434 has 32 divisors (see below), whose sum is σ = 38539272960. Its totient is φ = 8547130368.

The previous prime is 21211022431. The next prime is 21211022543. The reversal of 21211022434 is 43422011212.

It is not an unprimeable number, because it can be changed into a prime (21211022431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195979 + ... + 284305.

It is an arithmetic number, because the mean of its divisors is an integer number (1204352280).

Almost surely, 2^21211022434 is an apocalyptic number.

21211022434 is a deficient number, since it is larger than the sum of its proper divisors (17328250526).

21211022434 is a wasteful number, since it uses less digits than its factorization.

21211022434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89362.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21211022434 its reverse (43422011212), we get a palindrome (64633033646).

The spelling of 21211022434 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, four hundred thirty-four".