1221231302 has 4 divisors (see below), whose sum is σ = 1831846956.
Its totient is φ = 610615650.
The previous prime is 1221231293. The next prime is 1221231307. The reversal of 1221231302 is 2031321221.
Adding to 1221231302 its reverse (2031321221), we get a palindrome (3252552523).
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2031321221 = 31 ⋅65526491.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1221231307) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305307824 + ... + 305307827.
It is an arithmetic number, because the mean of its divisors is an integer number (457961739).
Almost surely, 21221231302 is an apocalyptic number.
1221231302 is a deficient number, since it is larger than the sum of its proper divisors (610615654).
1221231302 is an equidigital number, since it uses as much as digits as its factorization.
1221231302 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 610615653.
The product of its (nonzero) digits is 144, while the sum is 17.
The square root of 1221231302 is about 34946.1199849139.
The cubic root of 1221231302 is about 1068.8890854544.
The spelling of 1221231302 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, three hundred two".