1221210022 has 4 divisors (see below), whose sum is σ = 1831815036. Its totient is φ = 610605010.

The previous prime is 1221210017. The next prime is 1221210037. The reversal of 1221210022 is 2200121221.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221209984 and 1221210011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305302504 + ... + 305302507.

It is an arithmetic number, because the mean of its divisors is an integer number (457953759).

Almost surely, 2^1221210022 is an apocalyptic number.

1221210022 is a deficient number, since it is larger than the sum of its proper divisors (610605014).

1221210022 is an equidigital number, since it uses as much as digits as its factorization.

1221210022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610605013.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1221210022 is about 34945.8155148796. The cubic root of 1221210022 is about 1068.8828769412.

Adding to 1221210022 its reverse (2200121221), we get a palindrome (3421331243).

The spelling of 1221210022 in words is "one billion, two hundred twenty-one million, two hundred ten thousand, twenty-two".