21135837470 has 16 divisors (see below), whose sum is σ = 41503099248. Its totient is φ = 7685759040.

The previous prime is 21135837461. The next prime is 21135837473. The reversal of 21135837470 is 7473853112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135837473) 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, 96071879 + ... + 96072098.

It is an arithmetic number, because the mean of its divisors is an integer number (2593943703).

Almost surely, 2^21135837470 is an apocalyptic number.

21135837470 is a deficient number, since it is larger than the sum of its proper divisors (20367261778).

21135837470 is a wasteful number, since it uses less digits than its factorization.

21135837470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192143995.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 21135837470 in words is "twenty-one billion, one hundred thirty-five million, eight hundred thirty-seven thousand, four hundred seventy".