1221001022 has 16 divisors (see below), whose sum is σ = 1844934000. Its totient is φ = 606035520.

The previous prime is 1221000997. The next prime is 1221001051. The reversal of 1221001022 is 2201001221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221000994 and 1221001012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221354 + ... + 226802.

It is an arithmetic number, because the mean of its divisors is an integer number (115308375).

Almost surely, 2^1221001022 is an apocalyptic number.

1221001022 is a deficient number, since it is larger than the sum of its proper divisors (623932978).

1221001022 is a wasteful number, since it uses less digits than its factorization.

1221001022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6251.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221001022 is about 34942.8250432045. The cubic root of 1221001022 is about 1068.8218966395.

Adding to 1221001022 its reverse (2201001221), we get a palindrome (3422002243).

The spelling of 1221001022 in words is "one billion, two hundred twenty-one million, one thousand, twenty-two".