1221100022 has 4 divisors (see below), whose sum is σ = 1831650036. Its totient is φ = 610550010.

The previous prime is 1221099967. The next prime is 1221100033. The reversal of 1221100022 is 2200011221.

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 = 1221099976 and 1221100012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305275004 + ... + 305275007.

It is an arithmetic number, because the mean of its divisors is an integer number (457912509).

Almost surely, 2^1221100022 is an apocalyptic number.

1221100022 is a deficient number, since it is larger than the sum of its proper divisors (610550014).

1221100022 is an equidigital number, since it uses as much as digits as its factorization.

1221100022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610550013.

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

The square root of 1221100022 is about 34944.2416143204. The cubic root of 1221100022 is about 1068.8507829129.

Adding to 1221100022 its reverse (2200011221), we get a palindrome (3421111243).

The spelling of 1221100022 in words is "one billion, two hundred twenty-one million, one hundred thousand, twenty-two".