21120034434 has 32 divisors (see below), whose sum is σ = 42754957440. Its totient is φ = 6954532992.

The previous prime is 21120034427. The next prime is 21120034457. The reversal of 21120034434 is 43443002112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210984 + ... + 294540.

It is an arithmetic number, because the mean of its divisors is an integer number (1336092420).

Almost surely, 2^21120034434 is an apocalyptic number.

21120034434 is an abundant number, since it is smaller than the sum of its proper divisors (21634923006).

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

21120034434 is a wasteful number, since it uses less digits than its factorization.

21120034434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84074.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21120034434 its reverse (43443002112), we get a palindrome (64563036546).

The spelling of 21120034434 in words is "twenty-one billion, one hundred twenty million, thirty-four thousand, four hundred thirty-four".