210211121210021 has 4 divisors (see below), whose sum is σ = 210216814476672. Its totient is φ = 210205427943372.

The previous prime is 210211121210003. The next prime is 210211121210071. The reversal of 210211121210021 is 120012121112012.

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 a de Polignac number, because none of the positive numbers 2^k-210211121210021 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 (210211121210071) 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, 2846577941 + ... + 2846651786.

It is an arithmetic number, because the mean of its divisors is an integer number (52554203619168).

Almost surely, 2^{210211121210021} is an apocalyptic number.

It is an amenable number.

210211121210021 is a deficient number, since it is larger than the sum of its proper divisors (5693266651).

210211121210021 is an equidigital number, since it uses as much as digits as its factorization.

210211121210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5693266650.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 210211121210021 its reverse (120012121112012), we get a palindrome (330223242322033).

The spelling of 210211121210021 in words is "two hundred ten trillion, two hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".