1221120984 has 32 divisors (see below), whose sum is σ = 3054021120. Its totient is φ = 406877856.

The previous prime is 1221120961. The next prime is 1221121001. The reversal of 1221120984 is 4890211221.

It is a happy number.

It is a super-2 number, since 2×1221120984² = 2982272915130256512, which contains 22 as substring.

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, 61557 + ... + 78939.

It is an arithmetic number, because the mean of its divisors is an integer number (95438160).

Almost surely, 2^1221120984 is an apocalyptic number.

It is an amenable number.

1221120984 is an abundant number, since it is smaller than the sum of its proper divisors (1832900136).

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

1221120984 is a wasteful number, since it uses less digits than its factorization.

1221120984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20319 (or 20315 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1221120984 is about 34944.5415480015. The cubic root of 1221120984 is about 1068.8568990163.

The spelling of 1221120984 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, nine hundred eighty-four".