222121200000000 has 1584 divisors, whose sum is σ = 874068552476672. Its totient is φ = 49075200000000.

The previous prime is 222121199999999. The next prime is 222121200000013. The reversal of 222121200000000 is 2121222.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 260399999574 + ... + 260400000426.

Almost surely, 2^{222121200000000} is an apocalyptic number.

222121200000000 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 222121200000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (437034276238336).

222121200000000 is an abundant number, since it is smaller than the sum of its proper divisors (651947352476672).

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

222121200000000 is an frugal number, since it uses more digits than its factorization.

222121200000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 901 counting only the distinct ones).

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

Adding to 222121200000000 its reverse (2121222), we get a palindrome (222121202121222).

The spelling of 222121200000000 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred million", and thus it is an aban number.