250531221421 has 16 divisors (see below), whose sum is σ = 284513040000. Its totient is φ = 218694575808.

The previous prime is 250531221379. The next prime is 250531221427. The reversal of 250531221421 is 124122135052.

It is a happy number.

It is not a de Polignac number, because 250531221421 - 2¹¹ = 250531219373 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 250531221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250531221427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772921 + ... + 1048078.

It is an arithmetic number, because the mean of its divisors is an integer number (17782065000).

Almost surely, 2^250531221421 is an apocalyptic number.

It is an amenable number.

250531221421 is a deficient number, since it is larger than the sum of its proper divisors (33981818579).

250531221421 is a wasteful number, since it uses less digits than its factorization.

250531221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821588.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 250531221421 its reverse (124122135052), we get a palindrome (374653356473).

The spelling of 250531221421 in words is "two hundred fifty billion, five hundred thirty-one million, two hundred twenty-one thousand, four hundred twenty-one".