1221866522 has 8 divisors (see below), whose sum is σ = 1843775136. Its totient is φ = 607274812.

The previous prime is 1221866521. The next prime is 1221866557. The reversal of 1221866522 is 2256681221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1221866521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828808 + ... + 1829475.

It is an arithmetic number, because the mean of its divisors is an integer number (230471892).

Almost surely, 2^1221866522 is an apocalyptic number.

1221866522 is a deficient number, since it is larger than the sum of its proper divisors (621908614).

1221866522 is a wasteful number, since it uses less digits than its factorization.

1221866522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658452.

The product of its digits is 23040, while the sum is 35.

The square root of 1221866522 is about 34955.2073659991. The cubic root of 1221866522 is about 1069.0743798739.

The spelling of 1221866522 in words is "one billion, two hundred twenty-one million, eight hundred sixty-six thousand, five hundred twenty-two".