212001021021 has 8 divisors (see below), whose sum is σ = 282674047104. Its totient is φ = 141331004480.

The previous prime is 212001021017. The next prime is 212001021047. The reversal of 212001021021 is 120120100212.

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 212001021021 - 2² = 212001021017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212001020988 and 212001021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212001026021) 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, 582540 + ... + 873701.

It is an arithmetic number, because the mean of its divisors is an integer number (35334255888).

Almost surely, 2^212001021021 is an apocalyptic number.

It is an amenable number.

212001021021 is a deficient number, since it is larger than the sum of its proper divisors (70673026083).

212001021021 is a wasteful number, since it uses less digits than its factorization.

212001021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504771.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212001021021 its reverse (120120100212), we get a palindrome (332121121233).

The spelling of 212001021021 in words is "two hundred twelve billion, one million, twenty-one thousand, twenty-one".