2121022012212 has 36 divisors (see below), whose sum is σ = 5361517221060. Its totient is φ = 707001414912.

The previous prime is 2121022012163. The next prime is 2121022012217. The reversal of 2121022012212 is 2122102201212.

It is a happy number.

2121022012212 is a `hidden beast` number, since 21 + 210 + 220 + 1 + 2 + 212 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 875579404176 + 1245442608036 = 935724^2 + 1115994^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121022012217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7136778 + ... + 7428030.

Almost surely, 2^{2121022012212} is an apocalyptic number.

It is an amenable number.

2121022012212 is an abundant number, since it is smaller than the sum of its proper divisors (3240495208848).

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

2121022012212 is a wasteful number, since it uses less digits than its factorization.

2121022012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493552 (or 493547 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2121022012212 its reverse (2122102201212), we get a palindrome (4243124213424).

The spelling of 2121022012212 in words is "two trillion, one hundred twenty-one billion, twenty-two million, twelve thousand, two hundred twelve".