1221203002 has 4 divisors (see below), whose sum is σ = 1831804506. Its totient is φ = 610601500.

The previous prime is 1221202951. The next prime is 1221203059. The reversal of 1221203002 is 2003021221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 828806521 + 392396481 = 28789^2 + 19809^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305300749 + ... + 305300752.

Almost surely, 2^1221203002 is an apocalyptic number.

1221203002 is a deficient number, since it is larger than the sum of its proper divisors (610601504).

1221203002 is an equidigital number, since it uses as much as digits as its factorization.

1221203002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610601503.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221203002 is about 34945.7150735251. The cubic root of 1221203002 is about 1068.8808288162.

Adding to 1221203002 its reverse (2003021221), we get a palindrome (3224224223).

The spelling of 1221203002 in words is "one billion, two hundred twenty-one million, two hundred three thousand, two".