202121222 has 4 divisors (see below), whose sum is σ = 303181836. Its totient is φ = 101060610.

The previous prime is 202121219. The next prime is 202121233. The reversal of 202121222 is 222121202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222121202 = 2 ⋅111060601.

It is a junction number, because it is equal to n+sod(n) for n = 202121197 and 202121206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50530304 + ... + 50530307.

It is an arithmetic number, because the mean of its divisors is an integer number (75795459).

Almost surely, 2^202121222 is an apocalyptic number.

202121222 is a deficient number, since it is larger than the sum of its proper divisors (101060614).

202121222 is a wasteful number, since it uses less digits than its factorization.

202121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101060613.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 202121222 is about 14216.9343390198. The cubic root of 202121222 is about 586.8637779609.

Adding to 202121222 its reverse (222121202), we get a palindrome (424242424).

The spelling of 202121222 in words is "two hundred two million, one hundred twenty-one thousand, two hundred twenty-two".