1221140268 has 18 divisors (see below), whose sum is σ = 3086771324. Its totient is φ = 407046744.

The previous prime is 1221140233. The next prime is 1221140303. The reversal of 1221140268 is 8620411221.

It is an interprime number because it is at equal distance from previous prime (1221140233) and next prime (1221140303).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1221140268² = 2982367108262223648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16960246 + ... + 16960317.

Almost surely, 2^1221140268 is an apocalyptic number.

1221140268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1221140268 is an abundant number, since it is smaller than the sum of its proper divisors (1865631056).

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

1221140268 is a wasteful number, since it uses less digits than its factorization.

1221140268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33920573 (or 33920568 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1221140268 is about 34944.8174698338. The cubic root of 1221140268 is about 1068.8625254662.

Adding to 1221140268 its reverse (8620411221), we get a palindrome (9841551489).

The spelling of 1221140268 in words is "one billion, two hundred twenty-one million, one hundred forty thousand, two hundred sixty-eight".