211011011021 has 8 divisors (see below), whose sum is σ = 223430412600. Its totient is φ = 198592386048.

The previous prime is 211011010979. The next prime is 211011011023. The reversal of 211011011021 is 120110110112.

It can be written as a sum of positive squares in 4 ways, for example, as 97475708521 + 113535302500 = 312211^2 + 336950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211011011021 - 2¹⁸ = 211010748877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211011010993 and 211011011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211011011023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420965 + ... + 774101.

It is an arithmetic number, because the mean of its divisors is an integer number (27928801575).

Almost surely, 2^211011011021 is an apocalyptic number.

It is an amenable number.

211011011021 is a deficient number, since it is larger than the sum of its proper divisors (12419401579).

211011011021 is a wasteful number, since it uses less digits than its factorization.

211011011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388303.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 211011011021 its reverse (120110110112), we get a palindrome (331121121133).

Subtracting from 211011011021 its reverse (120110110112), we obtain a palindrome (90900900909).

The spelling of 211011011021 in words is "two hundred eleven billion, eleven million, eleven thousand, twenty-one".