1211022440321 has 4 divisors (see below), whose sum is σ = 1211028902100. Its totient is φ = 1211015978544.

The previous prime is 1211022440267. The next prime is 1211022440357. The reversal of 1211022440321 is 1230442201121.

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 195837226225 + 1015185214096 = 442535^2 + 1007564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211022440321 - 2¹⁴ = 1211022423937 is a prime.

It is a super-2 number, since 2×1211022440321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211022440921) 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, 2941106 + ... + 3327483.

It is an arithmetic number, because the mean of its divisors is an integer number (302757225525).

Almost surely, 2^{1211022440321} is an apocalyptic number.

It is an amenable number.

1211022440321 is a deficient number, since it is larger than the sum of its proper divisors (6461779).

1211022440321 is an equidigital number, since it uses as much as digits as its factorization.

1211022440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461778.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1211022440321 its reverse (1230442201121), we get a palindrome (2441464641442).

The spelling of 1211022440321 in words is "one trillion, two hundred eleven billion, twenty-two million, four hundred forty thousand, three hundred twenty-one".