211021202021 has 4 divisors (see below), whose sum is σ = 241167088032. Its totient is φ = 180875316012.

The previous prime is 211021202009. The next prime is 211021202027. The reversal of 211021202021 is 120202120112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211021202021 - 2³⁴ = 193841332837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211021201987 and 211021202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021202027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15072942995 + ... + 15072943008.

It is an arithmetic number, because the mean of its divisors is an integer number (60291772008).

Almost surely, 2^211021202021 is an apocalyptic number.

It is an amenable number.

211021202021 is a deficient number, since it is larger than the sum of its proper divisors (30145886011).

211021202021 is an equidigital number, since it uses as much as digits as its factorization.

211021202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30145886010.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211021202021 its reverse (120202120112), we get a palindrome (331223322133).

The spelling of 211021202021 in words is "two hundred eleven billion, twenty-one million, two hundred two thousand, twenty-one".