1222212021 has 8 divisors (see below), whose sum is σ = 1634233920. Its totient is φ = 812499072.

The previous prime is 1222212011. The next prime is 1222212023. The reversal of 1222212021 is 1202122221.

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

It is not a de Polignac number, because 1222212021 - 2¹¹ = 1222209973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222212023) 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, 576001 + ... + 578118.

It is an arithmetic number, because the mean of its divisors is an integer number (204279240).

Almost surely, 2^1222212021 is an apocalyptic number.

It is an amenable number.

1222212021 is a deficient number, since it is larger than the sum of its proper divisors (412021899).

1222212021 is a wasteful number, since it uses less digits than its factorization.

1222212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154475.

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

The square root of 1222212021 is about 34960.1490414443. The cubic root of 1222212021 is about 1069.1751353748.

Adding to 1222212021 its reverse (1202122221), we get a palindrome (2424334242).

The spelling of 1222212021 in words is "one billion, two hundred twenty-two million, two hundred twelve thousand, twenty-one".