1101221772 has 48 divisors (see below), whose sum is σ = 2938575360. Its totient is φ = 314422272.

The previous prime is 1101221749. The next prime is 1101221813. The reversal of 1101221772 is 2771221011.

It is a super-3 number, since 3×1101221772³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154348 + ... + 161324.

It is an arithmetic number, because the mean of its divisors is an integer number (61220320).

Almost surely, 2^1101221772 is an apocalyptic number.

1101221772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1101221772 is an abundant number, since it is smaller than the sum of its proper divisors (1837353588).

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

1101221772 is a wasteful number, since it uses less digits than its factorization.

1101221772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870 (or 8868 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 24.

The square root of 1101221772 is about 33184.6616978387. The cubic root of 1101221772 is about 1032.6621591794.

Adding to 1101221772 its reverse (2771221011), we get a palindrome (3872442783).

The spelling of 1101221772 in words is "one billion, one hundred one million, two hundred twenty-one thousand, seven hundred seventy-two".