212021101021 has 16 divisors (see below), whose sum is σ = 220081155840. Its totient is φ = 204011539200.

The previous prime is 212021101009. The next prime is 212021101037. The reversal of 212021101021 is 120101120212.

It is a cyclic number.

It is not a de Polignac number, because 212021101021 - 2¹⁵ = 212021068253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021100992 and 212021101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021101001) 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, 34466296 + ... + 34472446.

It is an arithmetic number, because the mean of its divisors is an integer number (13755072240).

Almost surely, 2^212021101021 is an apocalyptic number.

It is an amenable number.

212021101021 is a deficient number, since it is larger than the sum of its proper divisors (8060054819).

212021101021 is a wasteful number, since it uses less digits than its factorization.

212021101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10044.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212021101021 its reverse (120101120212), we get a palindrome (332122221233).

The spelling of 212021101021 in words is "two hundred twelve billion, twenty-one million, one hundred one thousand, twenty-one".