1222212101021 has 4 divisors (see below), whose sum is σ = 1226755640700. Its totient is φ = 1217668561344.

The previous prime is 1222212101003. The next prime is 1222212101051. The reversal of 1222212101021 is 1201012122221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 356660978521 + 865551122500 = 597211^2 + 930350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222212101021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222212101051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2271769436 + ... + 2271769973.

It is an arithmetic number, because the mean of its divisors is an integer number (306688910175).

Almost surely, 2^{1222212101021} is an apocalyptic number.

It is an amenable number.

1222212101021 is a deficient number, since it is larger than the sum of its proper divisors (4543539679).

1222212101021 is an equidigital number, since it uses as much as digits as its factorization.

1222212101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543539678.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1222212101021 its reverse (1201012122221), we get a palindrome (2423224223242).

The spelling of 1222212101021 in words is "one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred one thousand, twenty-one".