211020021010111 has 4 divisors (see below), whose sum is σ = 222126337905400. Its totient is φ = 199913704114824.

The previous prime is 211020021010091. The next prime is 211020021010153. The reversal of 211020021010111 is 111010120020112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 211020021010111 - 2⁵ = 211020021010079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020021010091 and 211020021010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020021010411) 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, 5553158447616 + ... + 5553158447653.

It is an arithmetic number, because the mean of its divisors is an integer number (55531584476350).

Almost surely, 2^{211020021010111} is an apocalyptic number.

211020021010111 is a deficient number, since it is larger than the sum of its proper divisors (11106316895289).

211020021010111 is a wasteful number, since it uses less digits than its factorization.

211020021010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106316895288.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211020021010111 its reverse (111010120020112), we get a palindrome (322030141030223).

The spelling of 211020021010111 in words is "two hundred eleven trillion, twenty billion, twenty-one million, ten thousand, one hundred eleven".