1221140120 has 32 divisors (see below), whose sum is σ = 2842311600. Its totient is φ = 471612288.

The previous prime is 1221140099. The next prime is 1221140153. The reversal of 1221140120 is 210411221.

It is a happy number.

It is a super-2 number, since 2×1221140120² = 2982366385347228800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221140095 and 1221140104.

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 in 7 ways as a sum of consecutive naturals, for example, 525194 + ... + 527513.

Almost surely, 2^1221140120 is an apocalyptic number.

1221140120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221140120 is an abundant number, since it is smaller than the sum of its proper divisors (1621171480).

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

1221140120 is a wasteful number, since it uses less digits than its factorization.

1221140120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052747 (or 1052743 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1221140120 is about 34944.8153522093. The cubic root of 1221140120 is about 1068.8624822848.

Adding to 1221140120 its reverse (210411221), we get a palindrome (1431551341).

The spelling of 1221140120 in words is "one billion, two hundred twenty-one million, one hundred forty thousand, one hundred twenty".