21125334147 has 32 divisors (see below), whose sum is σ = 30172108800. Its totient is φ = 13118257152.

The previous prime is 21125334127. The next prime is 21125334157. The reversal of 21125334147 is 74143352112.

It is not a de Polignac number, because 21125334147 - 2¹⁶ = 21125268611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21125334127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371379 + ... + 424467.

It is an arithmetic number, because the mean of its divisors is an integer number (942878400).

Almost surely, 2^21125334147 is an apocalyptic number.

21125334147 is a deficient number, since it is larger than the sum of its proper divisors (9046774653).

21125334147 is a wasteful number, since it uses less digits than its factorization.

21125334147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53267.

The product of its digits is 20160, while the sum is 33.

Adding to 21125334147 its reverse (74143352112), we get a palindrome (95268686259).

The spelling of 21125334147 in words is "twenty-one billion, one hundred twenty-five million, three hundred thirty-four thousand, one hundred forty-seven".