212021023121 has 8 divisors (see below), whose sum is σ = 215030261160. Its totient is φ = 209014618752.

The previous prime is 212021023091. The next prime is 212021023141. The reversal of 212021023121 is 121320120212.

It can be written as a sum of positive squares in 4 ways, for example, as 58545125521 + 153475897600 = 241961^2 + 391760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212021023121 - 2³⁰ = 210947281297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212021023121.

It is not an unprimeable number, because it can be changed into a prime (212021023141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557486 + ... + 857223.

It is an arithmetic number, because the mean of its divisors is an integer number (26878782645).

Almost surely, 2^212021023121 is an apocalyptic number.

It is an amenable number.

212021023121 is a deficient number, since it is larger than the sum of its proper divisors (3009238039).

212021023121 is a wasteful number, since it uses less digits than its factorization.

212021023121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416835.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212021023121 its reverse (121320120212), we get a palindrome (333341143333).

The spelling of 212021023121 in words is "two hundred twelve billion, twenty-one million, twenty-three thousand, one hundred twenty-one".