222121122000 has 160 divisors (see below), whose sum is σ = 716430109824. Its totient is φ = 59206528000.

The previous prime is 222121121977. The next prime is 222121122023. The reversal of 222121122000 is 221121222.

It is an interprime number because it is at equal distance from previous prime (222121121977) and next prime (222121122023).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16655335 + ... + 16668665.

Almost surely, 2^222121122000 is an apocalyptic number.

222121122000 is a gapful number since it is divisible by the number (20) 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 222121122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358215054912).

222121122000 is an abundant number, since it is smaller than the sum of its proper divisors (494308987824).

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

222121122000 is a wasteful number, since it uses less digits than its factorization.

222121122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16134 (or 16118 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 222121122000 its reverse (221121222), we get a palindrome (222342243222).

The spelling of 222121122000 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-two thousand".