1221112000 has 56 divisors (see below), whose sum is σ = 3024103680. Its totient is φ = 488441600.

The previous prime is 1221111977. The next prime is 1221112001. The reversal of 1221112000 is 2111221.

It is a super-2 number, since 2×1221112000² = 2982229033088000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1221112001) 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, 68320 + ... + 84319.

Almost surely, 2^1221112000 is an apocalyptic number.

1221112000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221112000 is an abundant number, since it is smaller than the sum of its proper divisors (1802991680).

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

1221112000 is an equidigital number, since it uses as much as digits as its factorization.

1221112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152666 (or 152646 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1221112000 is about 34944.4130012224. The cubic root of 1221112000 is about 1068.8542777544.

Adding to 1221112000 its reverse (2111221), we get a palindrome (1223223221).

The spelling of 1221112000 in words is "one billion, two hundred twenty-one million, one hundred twelve thousand".