1221211022 has 4 divisors (see below), whose sum is σ = 1831816536. Its totient is φ = 610605510.

The previous prime is 1221211021. The next prime is 1221211037. The reversal of 1221211022 is 2201121221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2201121221 = 13 ⋅169317017.

It is a junction number, because it is equal to n+sod(n) for n = 1221210988 and 1221211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305302754 + ... + 305302757.

It is an arithmetic number, because the mean of its divisors is an integer number (457954134).

Almost surely, 2^1221211022 is an apocalyptic number.

1221211022 is a deficient number, since it is larger than the sum of its proper divisors (610605514).

1221211022 is an equidigital number, since it uses as much as digits as its factorization.

1221211022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610605513.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1221211022 is about 34945.8298227414. The cubic root of 1221211022 is about 1068.8831686962.

Adding to 1221211022 its reverse (2201121221), we get a palindrome (3422332243).

The spelling of 1221211022 in words is "one billion, two hundred twenty-one million, two hundred eleven thousand, twenty-two".