211011101010221 has 4 divisors (see below), whose sum is σ = 214160520428352. Its totient is φ = 207861681592092.

The previous prime is 211011101010163. The next prime is 211011101010233. The reversal of 211011101010221 is 122010101110112.

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 211011101010221 - 2¹⁴ = 211011100993837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211011101010196 and 211011101010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211011101030221) 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, 1574709708965 + ... + 1574709709098.

It is an arithmetic number, because the mean of its divisors is an integer number (53540130107088).

Almost surely, 2^{211011101010221} is an apocalyptic number.

It is an amenable number.

211011101010221 is a deficient number, since it is larger than the sum of its proper divisors (3149419418131).

211011101010221 is an equidigital number, since it uses as much as digits as its factorization.

211011101010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149419418130.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211011101010221 its reverse (122010101110112), we get a palindrome (333021202120333).

The spelling of 211011101010221 in words is "two hundred eleven trillion, eleven billion, one hundred one million, ten thousand, two hundred twenty-one".