21112625545221 has 8 divisors (see below), whose sum is σ = 32171619878464. Its totient is φ = 12064357454400.

The previous prime is 21112625545213. The next prime is 21112625545261. The reversal of 21112625545221 is 12254552621112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21112625545221 - 2³ = 21112625545213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112625545221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112625545261) 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, 502681560580 + ... + 502681560621.

It is an arithmetic number, because the mean of its divisors is an integer number (4021452484808).

Almost surely, 2^{21112625545221} is an apocalyptic number.

21112625545221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21112625545221 is a deficient number, since it is larger than the sum of its proper divisors (11058994333243).

21112625545221 is a wasteful number, since it uses less digits than its factorization.

21112625545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005363121211.

The product of its digits is 96000, while the sum is 39.

The spelling of 21112625545221 in words is "twenty-one trillion, one hundred twelve billion, six hundred twenty-five million, five hundred forty-five thousand, two hundred twenty-one".