1221021022 has 16 divisors (see below), whose sum is σ = 2088443952. Its totient is φ = 530398080.

The previous prime is 1221021007. The next prime is 1221021059. The reversal of 1221021022 is 2201201221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1221020993 and 1221021011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1380804 + ... + 1381687.

It is an arithmetic number, because the mean of its divisors is an integer number (130527747).

Almost surely, 2^1221021022 is an apocalyptic number.

1221021022 is a deficient number, since it is larger than the sum of its proper divisors (867422930).

1221021022 is a wasteful number, since it uses less digits than its factorization.

1221021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762523.

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

The square root of 1221021022 is about 34943.1112238163. Note that the first 3 decimals coincide. The cubic root of 1221021022 is about 1068.8277323762.

Adding to 1221021022 its reverse (2201201221), we get a palindrome (3422222243).

The spelling of 1221021022 in words is "one billion, two hundred twenty-one million, twenty-one thousand, twenty-two".