221400375 has 48 divisors (see below), whose sum is σ = 428594400. Its totient is φ = 101203200.

The previous prime is 221400373. The next prime is 221400379. The reversal of 221400375 is 573004122.

It is not a de Polignac number, because 221400375 - 2¹ = 221400373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221400373) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12351 + ... + 24399.

It is an arithmetic number, because the mean of its divisors is an integer number (8929050).

Almost surely, 2^221400375 is an apocalyptic number.

221400375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221400375 is a deficient number, since it is larger than the sum of its proper divisors (207194025).

221400375 is a wasteful number, since it uses less digits than its factorization.

221400375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12081 (or 12064 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 221400375 is about 14879.5287223756. The cubic root of 221400375 is about 604.9592441184.

Adding to 221400375 its reverse (573004122), we get a palindrome (794404497).

The spelling of 221400375 in words is "two hundred twenty-one million, four hundred thousand, three hundred seventy-five".