21121034470 has 16 divisors (see below), whose sum is σ = 38023262640. Its totient is φ = 8447213664.

The previous prime is 21121034437. The next prime is 21121034471. The reversal of 21121034470 is 7443012112.

21121034470 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121034471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74280 + ... + 218539.

It is an arithmetic number, because the mean of its divisors is an integer number (2376453915).

Almost surely, 2^21121034470 is an apocalyptic number.

21121034470 is a deficient number, since it is larger than the sum of its proper divisors (16902228170).

21121034470 is a wasteful number, since it uses less digits than its factorization.

21121034470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300039.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 21121034470 its reverse (7443012112), we get a palindrome (28564046582).

The spelling of 21121034470 in words is "twenty-one billion, one hundred twenty-one million, thirty-four thousand, four hundred seventy".