1221051120 has 40 divisors (see below), whose sum is σ = 3785259216. Its totient is φ = 325613568.

The previous prime is 1221051103. The next prime is 1221051121. The reversal of 1221051120 is 211501221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×1221051120³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1221051120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221051121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543617 + ... + 2544096.

Almost surely, 2^1221051120 is an apocalyptic number.

1221051120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221051120 is an abundant number, since it is smaller than the sum of its proper divisors (2564208096).

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

1221051120 is a wasteful number, since it uses less digits than its factorization.

1221051120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087729 (or 5087723 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1221051120 is about 34943.5418926016. The cubic root of 1221051120 is about 1068.8365144561.

Adding to 1221051120 its reverse (211501221), we get a palindrome (1432552341).

The spelling of 1221051120 in words is "one billion, two hundred twenty-one million, fifty-one thousand, one hundred twenty".