1200022211221 has 6 divisors (see below), whose sum is σ = 1242829187522. Its totient is φ = 1158642134160.

The previous prime is 1200022211123. The next prime is 1200022211327. The reversal of 1200022211221 is 1221122200021.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 14133880996 + 1185888330225 = 118886^2 + 1088985^2 .

It is not a de Polignac number, because 1200022211221 - 2¹¹ = 1200022209173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200022211195 and 1200022211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200022211021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 713448750 + ... + 713450431.

Almost surely, 2^{1200022211221} is an apocalyptic number.

It is an amenable number.

1200022211221 is a deficient number, since it is larger than the sum of its proper divisors (42806976301).

1200022211221 is an equidigital number, since it uses as much as digits as its factorization.

1200022211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426899239 (or 1426899210 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1200022211221 its reverse (1221122200021), we get a palindrome (2421144411242).

The spelling of 1200022211221 in words is "one trillion, two hundred billion, twenty-two million, two hundred eleven thousand, two hundred twenty-one".