1221022044 has 36 divisors (see below), whose sum is σ = 3367061880. Its totient is φ = 370006560.

The previous prime is 1221022037. The next prime is 1221022057. The reversal of 1221022044 is 4402201221.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1541299 + ... + 1542090.

Almost surely, 2^1221022044 is an apocalyptic number.

It is an amenable number.

1221022044 is an abundant number, since it is smaller than the sum of its proper divisors (2146039836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221022044 is a wasteful number, since it uses less digits than its factorization.

1221022044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083410 (or 3083405 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1221022044 is about 34943.1258475827. The cubic root of 1221022044 is about 1068.8280305806.

Adding to 1221022044 its reverse (4402201221), we get a palindrome (5623223265).

The spelling of 1221022044 in words is "one billion, two hundred twenty-one million, twenty-two thousand, forty-four".