1221206270 has 8 divisors (see below), whose sum is σ = 2198171304. Its totient is φ = 488482504.

The previous prime is 1221206257. The next prime is 1221206303. The reversal of 1221206270 is 726021221.

It is a happy number.

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, 61060304 + ... + 61060323.

It is an arithmetic number, because the mean of its divisors is an integer number (274771413).

Almost surely, 2^1221206270 is an apocalyptic number.

1221206270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221206270 is a deficient number, since it is larger than the sum of its proper divisors (976965034).

1221206270 is a wasteful number, since it uses less digits than its factorization.

1221206270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122120634.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1221206270 is about 34945.7618317300. The cubic root of 1221206270 is about 1068.8817822748.

Adding to 1221206270 its reverse (726021221), we get a palindrome (1947227491).

The spelling of 1221206270 in words is "one billion, two hundred twenty-one million, two hundred six thousand, two hundred seventy".