1221446247 has 16 divisors (see below), whose sum is σ = 1889033472. Its totient is φ = 687551040.

The previous prime is 1221446201. The next prime is 1221446251. The reversal of 1221446247 is 7426441221.

1221446247 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1221446247 - 2⁸ = 1221445991 is a prime.

It is a super-3 number, since 3×1221446247³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221446287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432654 + ... + 435467.

It is an arithmetic number, because the mean of its divisors is an integer number (118064592).

Almost surely, 2^1221446247 is an apocalyptic number.

1221446247 is a deficient number, since it is larger than the sum of its proper divisors (667587225).

1221446247 is an equidigital number, since it uses as much as digits as its factorization.

1221446247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868198.

The product of its digits is 21504, while the sum is 33.

The square root of 1221446247 is about 34949.1952267860. The cubic root of 1221446247 is about 1068.9517923541.

Adding to 1221446247 its reverse (7426441221), we get a palindrome (8647887468).

The spelling of 1221446247 in words is "one billion, two hundred twenty-one million, four hundred forty-six thousand, two hundred forty-seven".