21050144510221 has 8 divisors (see below), whose sum is σ = 21082944726144. Its totient is φ = 21017345114160.

The previous prime is 21050144510201. The next prime is 21050144510231. The reversal of 21050144510221 is 12201544105012.

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

It is a cyclic number.

It is not a de Polignac number, because 21050144510221 - 2⁷ = 21050144510093 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 21050144510221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050144510201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69713056 + ... + 70014358.

It is an arithmetic number, because the mean of its divisors is an integer number (2635368090768).

Almost surely, 2^{21050144510221} is an apocalyptic number.

It is an amenable number.

21050144510221 is a deficient number, since it is larger than the sum of its proper divisors (32800215923).

21050144510221 is a wasteful number, since it uses less digits than its factorization.

21050144510221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409931.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 21050144510221 its reverse (12201544105012), we get a palindrome (33251688615233).

The spelling of 21050144510221 in words is "twenty-one trillion, fifty billion, one hundred forty-four million, five hundred ten thousand, two hundred twenty-one".