1212220222001 has 4 divisors (see below), whose sum is σ = 1217422884132. Its totient is φ = 1207017559872.

The previous prime is 1212220221991. The next prime is 1212220222013. The reversal of 1212220222001 is 1002220222121.

It is a happy number.

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 658408907776 + 553811314225 = 811424^2 + 744185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212220222001 - 2¹⁸ = 1212219959857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212220222901) 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, 2601330716 + ... + 2601331181.

It is an arithmetic number, because the mean of its divisors is an integer number (304355721033).

Almost surely, 2^{1212220222001} is an apocalyptic number.

It is an amenable number.

1212220222001 is a deficient number, since it is larger than the sum of its proper divisors (5202662131).

1212220222001 is an equidigital number, since it uses as much as digits as its factorization.

1212220222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5202662130.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1212220222001 its reverse (1002220222121), we get a palindrome (2214440444122).

The spelling of 1212220222001 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty-two thousand, one".