221064225 has 12 divisors (see below), whose sum is σ = 365492976. Its totient is φ = 117900880.

The previous prime is 221064223. The next prime is 221064227. The reversal of 221064225 is 522460122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221064223) and next prime (221064227).

It is not a de Polignac number, because 221064225 - 2¹ = 221064223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221064195 and 221064204.

It is not an unprimeable number, because it can be changed into a prime (221064223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1473687 + ... + 1473836.

It is an arithmetic number, because the mean of its divisors is an integer number (30457748).

Almost surely, 2^221064225 is an apocalyptic number.

221064225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221064225 is a deficient number, since it is larger than the sum of its proper divisors (144428751).

221064225 is a wasteful number, since it uses less digits than its factorization.

221064225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2947536 (or 2947531 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 221064225 is about 14868.2287109124. The cubic root of 221064225 is about 604.6529211576.

The spelling of 221064225 in words is "two hundred twenty-one million, sixty-four thousand, two hundred twenty-five".