1212222000 has 160 divisors (see below), whose sum is σ = 4263727104. Its totient is φ = 293856000.

The previous prime is 1212221981. The next prime is 1212222001. The reversal of 1212222000 is 2222121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212222001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56817 + ... + 75183.

Almost surely, 2^1212222000 is an apocalyptic number.

1212222000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2131863552).

1212222000 is an abundant number, since it is smaller than the sum of its proper divisors (3051505104).

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

1212222000 is a wasteful number, since it uses less digits than its factorization.

1212222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18404 (or 18388 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1212222000 is about 34816.9786167611. The cubic root of 1212222000 is about 1066.2541156332.

Adding to 1212222000 its reverse (2222121), we get a palindrome (1214444121).

The spelling of 1212222000 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand".