221964098225 has 12 divisors (see below), whose sum is σ = 275505087900. Its totient is φ = 177397339200.

The previous prime is 221964098173. The next prime is 221964098233. The reversal of 221964098225 is 522890469122.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8393491456 + 213570606769 = 91616^2 + 462137^2 .

It is not a de Polignac number, because 221964098225 - 2²⁴ = 221947321009 is a prime.

It is a Curzon 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, 4322450 + ... + 4373499.

It is an arithmetic number, because the mean of its divisors is an integer number (22958757325).

Almost surely, 2^221964098225 is an apocalyptic number.

221964098225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221964098225 is a deficient number, since it is larger than the sum of its proper divisors (53540989675).

221964098225 is a wasteful number, since it uses less digits than its factorization.

221964098225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8696980 (or 8696975 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 221964098225 in words is "two hundred twenty-one billion, nine hundred sixty-four million, ninety-eight thousand, two hundred twenty-five".