1212222221021 has 8 divisors (see below), whose sum is σ = 1387733079744. Its totient is φ = 1037295426240.

The previous prime is 1212222220987. The next prime is 1212222221027. The reversal of 1212222221021 is 1201222222121.

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 1212222221021 - 2¹⁸ = 1212221958877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212222220984 and 1212222221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212222221027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146011535 + ... + 146019836.

It is an arithmetic number, because the mean of its divisors is an integer number (173466634968).

Almost surely, 2^{1212222221021} is an apocalyptic number.

It is an amenable number.

1212222221021 is a deficient number, since it is larger than the sum of its proper divisors (175510858723).

1212222221021 is an equidigital number, since it uses as much as digits as its factorization.

1212222221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292031971.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1212222221021 its reverse (1201222222121), we get a palindrome (2413444443142).

The spelling of 1212222221021 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".