222121531 has 8 divisors (see below), whose sum is σ = 227487744. Its totient is φ = 216764520.

The previous prime is 222121517. The next prime is 222121547. The reversal of 222121531 is 135121222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 222121531 - 2¹⁷ = 221990459 is a prime.

It is a super-2 number, since 2×222121531² = 98675949067567922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121499 and 222121508.

It is not an unprimeable number, because it can be changed into a prime (222121831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89550 + ... + 91996.

It is an arithmetic number, because the mean of its divisors is an integer number (28435968).

Almost surely, 2^222121531 is an apocalyptic number.

222121531 is a deficient number, since it is larger than the sum of its proper divisors (5366213).

222121531 is a wasteful number, since it uses less digits than its factorization.

222121531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601.

The product of its digits is 240, while the sum is 19.

The square root of 222121531 is about 14903.7421810765. The cubic root of 222121531 is about 605.6153664097.

Adding to 222121531 its reverse (135121222), we get a palindrome (357242753).

The spelling of 222121531 in words is "two hundred twenty-two million, one hundred twenty-one thousand, five hundred thirty-one".