1220121001205 has 4 divisors (see below), whose sum is σ = 1464145201452. Its totient is φ = 976096800960.

The previous prime is 1220121001193. The next prime is 1220121001213. The reversal of 1220121001205 is 5021001210221.

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 189031039729 + 1031089961476 = 434777^2 + 1015426^2 .

It is not a de Polignac number, because 1220121001205 - 2²² = 1220116806901 is a prime.

It is a super-2 number, since 2×1220121001205² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122012100116 + ... + 122012100125.

It is an arithmetic number, because the mean of its divisors is an integer number (366036300363).

Almost surely, 2^{1220121001205} is an apocalyptic number.

It is an amenable number.

1220121001205 is a deficient number, since it is larger than the sum of its proper divisors (244024200247).

1220121001205 is an equidigital number, since it uses as much as digits as its factorization.

1220121001205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244024200246.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 1220121001205 its reverse (5021001210221), we get a palindrome (6241122211426).

The spelling of 1220121001205 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one thousand, two hundred five".