1221122000 has 80 divisors (see below), whose sum is σ = 3374522112. Its totient is φ = 418665600.

The previous prime is 1221121991. The next prime is 1221122009. The reversal of 1221122000 is 2211221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221121991) and next prime (1221122009).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1221122000² = 2982277877768000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221122009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29612 + ... + 57611.

Almost surely, 2^1221122000 is an apocalyptic number.

1221122000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221122000 is an abundant number, since it is smaller than the sum of its proper divisors (2153400112).

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

1221122000 is an equidigital number, since it uses as much as digits as its factorization.

1221122000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87253 (or 87237 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221122000 is about 34944.5560853189. The cubic root of 1221122000 is about 1068.8571954539.

Adding to 1221122000 its reverse (2211221), we get a palindrome (1223333221).

The spelling of 1221122000 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand".