222121512 has 48 divisors (see below), whose sum is σ = 610066080. Its totient is φ = 72996000.

The previous prime is 222121481. The next prime is 222121517. The reversal of 222121512 is 215121222.

222121512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×222121512² = 98675932186332288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (222121517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16614 + ... + 26837.

It is an arithmetic number, because the mean of its divisors is an integer number (12709710).

Almost surely, 2^222121512 is an apocalyptic number.

It is an amenable number.

222121512 is an abundant number, since it is smaller than the sum of its proper divisors (387944568).

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

222121512 is a wasteful number, since it uses less digits than its factorization.

222121512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43534 (or 43527 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 222121512 is about 14903.7415436527. The cubic root of 222121512 is about 605.6153491419.

Adding to 222121512 its reverse (215121222), we get a palindrome (437242734).

The spelling of 222121512 in words is "two hundred twenty-two million, one hundred twenty-one thousand, five hundred twelve".