210021220021211 has 4 divisors (see below), whose sum is σ = 221074968443400. Its totient is φ = 198967471599024.

The previous prime is 210021220021127. The next prime is 210021220021253. The reversal of 210021220021211 is 112120022120012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021220021211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021220021211.

It is not an unprimeable number, because it can be changed into a prime (210021220021411) 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, 5526874211066 + ... + 5526874211103.

It is an arithmetic number, because the mean of its divisors is an integer number (55268742110850).

Almost surely, 2^{210021220021211} is an apocalyptic number.

210021220021211 is a deficient number, since it is larger than the sum of its proper divisors (11053748422189).

210021220021211 is a wasteful number, since it uses less digits than its factorization.

210021220021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11053748422188.

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

Adding to 210021220021211 its reverse (112120022120012), we get a palindrome (322141242141223).

The spelling of 210021220021211 in words is "two hundred ten trillion, twenty-one billion, two hundred twenty million, twenty-one thousand, two hundred eleven".