1225606221 has 48 divisors (see below), whose sum is σ = 2189451264. Its totient is φ = 669875184.

The previous prime is 1225606183. The next prime is 1225606231. The reversal of 1225606221 is 1226065221.

1225606221 is a `hidden beast` number, since 1 + 22 + 560 + 62 + 21 = 666.

It is not a de Polignac number, because 1225606221 - 2⁶ = 1225606157 is a prime.

It is a super-2 number, since 2×1225606221² = 3004221217907801682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225606231) 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, 23460 + ... + 54786.

It is an arithmetic number, because the mean of its divisors is an integer number (45613568).

Almost surely, 2^1225606221 is an apocalyptic number.

It is an amenable number.

1225606221 is a deficient number, since it is larger than the sum of its proper divisors (963845043).

1225606221 is an equidigital number, since it uses as much as digits as its factorization.

1225606221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31372 (or 31360 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1225606221 is about 35008.6592288251. The cubic root of 1225606221 is about 1070.1639545542.

The spelling of 1225606221 in words is "one billion, two hundred twenty-five million, six hundred six thousand, two hundred twenty-one".