1212210012128 has 96 divisors (see below), whose sum is σ = 2520414973440. Its totient is φ = 572766937600.

The previous prime is 1212210012127. The next prime is 1212210012227. The reversal of 1212210012128 is 8212100122121.

It is a super-2 number, since 2×1212210012128² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210012127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34697453 + ... + 34732371.

It is an arithmetic number, because the mean of its divisors is an integer number (26254322640).

Almost surely, 2^{1212210012128} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212210012128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260207486720).

1212210012128 is an abundant number, since it is smaller than the sum of its proper divisors (1308204961312).

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

1212210012128 is a wasteful number, since it uses less digits than its factorization.

1212210012128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35520 (or 35512 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 1212210012128 its reverse (8212100122121), we get a palindrome (9424310134249).

The spelling of 1212210012128 in words is "one trillion, two hundred twelve billion, two hundred ten million, twelve thousand, one hundred twenty-eight".