221421153325 has 12 divisors (see below), whose sum is σ = 290712950100. Its totient is φ = 166717103360.

The previous prime is 221421153313. The next prime is 221421153361. The reversal of 221421153325 is 523351124122.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13925416036 + 207495737289 = 118006^2 + 455517^2 .

It is not a de Polignac number, because 221421153325 - 2¹³ = 221421145133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260495050 + ... + 260495899.

It is an arithmetic number, because the mean of its divisors is an integer number (24226079175).

Almost surely, 2^221421153325 is an apocalyptic number.

221421153325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221421153325 is a deficient number, since it is larger than the sum of its proper divisors (69291796775).

221421153325 is a wasteful number, since it uses less digits than its factorization.

221421153325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520990976 (or 520990971 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

Adding to 221421153325 its reverse (523351124122), we get a palindrome (744772277447).

The spelling of 221421153325 in words is "two hundred twenty-one billion, four hundred twenty-one million, one hundred fifty-three thousand, three hundred twenty-five".