212031021321 has 48 divisors (see below), whose sum is σ = 350804213760. Its totient is φ = 120889311840.

The previous prime is 212031021317. The next prime is 212031021331. The reversal of 212031021321 is 123120130212.

212031021321 is a `hidden beast` number, since 2 + 12 + 0 + 310 + 21 + 321 = 666.

It is not a de Polignac number, because 212031021321 - 2² = 212031021317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212031021294 and 212031021303.

It is not an unprimeable number, because it can be changed into a prime (212031021331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68862060 + ... + 68865138.

It is an arithmetic number, because the mean of its divisors is an integer number (7308421120).

Almost surely, 2^212031021321 is an apocalyptic number.

212031021321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212031021321 is a deficient number, since it is larger than the sum of its proper divisors (138773192439).

212031021321 is a wasteful number, since it uses less digits than its factorization.

212031021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186 (or 5183 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 212031021321 its reverse (123120130212), we get a palindrome (335151151533).

The spelling of 212031021321 in words is "two hundred twelve billion, thirty-one million, twenty-one thousand, three hundred twenty-one".