21135111434 has 64 divisors (see below), whose sum is σ = 35380800000. Its totient is φ = 9427170816.

The previous prime is 21135111421. The next prime is 21135111449. The reversal of 21135111434 is 43411153112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20147342 + ... + 20148390.

It is an arithmetic number, because the mean of its divisors is an integer number (552825000).

Almost surely, 2^21135111434 is an apocalyptic number.

21135111434 is a deficient number, since it is larger than the sum of its proper divisors (14245688566).

21135111434 is a wasteful number, since it uses less digits than its factorization.

21135111434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its digits is 1440, while the sum is 26.

Adding to 21135111434 its reverse (43411153112), we get a palindrome (64546264546).

The spelling of 21135111434 in words is "twenty-one billion, one hundred thirty-five million, one hundred eleven thousand, four hundred thirty-four".