1221402202 has 4 divisors (see below), whose sum is σ = 1832103306. Its totient is φ = 610701100.

The previous prime is 1221402199. The next prime is 1221402209. The reversal of 1221402202 is 2022041221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2022041221 = 14879 ⋅135899.

It can be written as a sum of positive squares in only one way, i.e., 859603761 + 361798441 = 29319^2 + 19021^2 .

It is not an unprimeable number, because it can be changed into a prime (1221402209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305350549 + ... + 305350552.

Almost surely, 2^1221402202 is an apocalyptic number.

1221402202 is a deficient number, since it is larger than the sum of its proper divisors (610701104).

1221402202 is an equidigital number, since it uses as much as digits as its factorization.

1221402202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610701103.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1221402202 is about 34948.5650921465. The cubic root of 1221402202 is about 1068.9389435017.

Adding to 1221402202 its reverse (2022041221), we get a palindrome (3243443423).

The spelling of 1221402202 in words is "one billion, two hundred twenty-one million, four hundred two thousand, two hundred two".