211100320021 has 16 divisors (see below), whose sum is σ = 223381609600. Its totient is φ = 198938757888.

The previous prime is 211100320019. The next prime is 211100320027. The reversal of 211100320021 is 120023001112.

It is a cyclic number.

It is not a de Polignac number, because 211100320021 - 2¹ = 211100320019 is a prime.

It is a super-2 number, since 2×211100320021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211100319983 and 211100320010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100320027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2859745 + ... + 2932633.

It is an arithmetic number, because the mean of its divisors is an integer number (13961350600).

Almost surely, 2^211100320021 is an apocalyptic number.

It is an amenable number.

211100320021 is a deficient number, since it is larger than the sum of its proper divisors (12281289579).

211100320021 is a wasteful number, since it uses less digits than its factorization.

211100320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73708.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 211100320021 its reverse (120023001112), we get a palindrome (331123321133).

The spelling of 211100320021 in words is "two hundred eleven billion, one hundred million, three hundred twenty thousand, twenty-one".