1221248206 has 8 divisors (see below), whose sum is σ = 1837652040. Its totient is φ = 608697528.

The previous prime is 1221248191. The next prime is 1221248213. The reversal of 1221248206 is 6028421221.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962496 + ... + 963763.

It is an arithmetic number, because the mean of its divisors is an integer number (229706505).

Almost surely, 2^1221248206 is an apocalyptic number.

1221248206 is a deficient number, since it is larger than the sum of its proper divisors (616403834).

1221248206 is a wasteful number, since it uses less digits than its factorization.

1221248206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926578.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1221248206 is about 34946.3618421146. The cubic root of 1221248206 is about 1068.8940172031.

Adding to 1221248206 its reverse (6028421221), we get a palindrome (7249669427).

The spelling of 1221248206 in words is "one billion, two hundred twenty-one million, two hundred forty-eight thousand, two hundred six".