1212020244421 has 6 divisors (see below), whose sum is σ = 1409901100710. Its totient is φ = 1038874495176.

The previous prime is 1212020244419. The next prime is 1212020244509. The reversal of 1212020244421 is 1244420202121.

It can be written as a sum of positive squares in only one way, i.e., 855717502500 + 356302741921 = 925050^2 + 596911^2 .

It is not a de Polignac number, because 1212020244421 - 2¹ = 1212020244419 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 (1212020244221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12367553466 + ... + 12367553563.

It is an arithmetic number, because the mean of its divisors is an integer number (234983516785).

Almost surely, 2^{1212020244421} is an apocalyptic number.

It is an amenable number.

1212020244421 is a deficient number, since it is larger than the sum of its proper divisors (197880856289).

1212020244421 is an equidigital number, since it uses as much as digits as its factorization.

1212020244421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24735107043 (or 24735107036 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 1212020244421 its reverse (1244420202121), we get a palindrome (2456440446542).

The spelling of 1212020244421 in words is "one trillion, two hundred twelve billion, twenty million, two hundred forty-four thousand, four hundred twenty-one".