1212142443220 has 96 divisors (see below), whose sum is σ = 2716043853600. Its totient is φ = 452815503360.

The previous prime is 1212142443217. The next prime is 1212142443233. The reversal of 1212142443220 is 223442412121.

It can be written as a sum of positive squares in 16 ways, for example, as 55734710724 + 1156407732496 = 236082^2 + 1075364^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164936106 + ... + 164943454.

It is an arithmetic number, because the mean of its divisors is an integer number (28292123475).

Almost surely, 2^{1212142443220} is an apocalyptic number.

1212142443220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212142443220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1358021926800).

1212142443220 is an abundant number, since it is smaller than the sum of its proper divisors (1503901410380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212142443220 is a wasteful number, since it uses less digits than its factorization.

1212142443220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11053 (or 11051 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 1212142443220 its reverse (223442412121), we get a palindrome (1435584855341).

The spelling of 1212142443220 in words is "one trillion, two hundred twelve billion, one hundred forty-two million, four hundred forty-three thousand, two hundred twenty".