210021220211021 has 4 divisors (see below), whose sum is σ = 221074968643200. Its totient is φ = 198967471778844.

The previous prime is 210021220211003. The next prime is 210021220211051. The reversal of 210021220211021 is 120112022120012.

210021220211021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 210021220211021 - 2¹⁴ = 210021220194637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021220211051) 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, 5526874216061 + ... + 5526874216098.

It is an arithmetic number, because the mean of its divisors is an integer number (55268742160800).

Almost surely, 2^{210021220211021} is an apocalyptic number.

It is an amenable number.

210021220211021 is a deficient number, since it is larger than the sum of its proper divisors (11053748432179).

210021220211021 is a wasteful number, since it uses less digits than its factorization.

210021220211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11053748432178.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210021220211021 its reverse (120112022120012), we get a palindrome (330133242331033).

The spelling of 210021220211021 in words is "two hundred ten trillion, twenty-one billion, two hundred twenty million, two hundred eleven thousand, twenty-one".