211011210021 has 16 divisors (see below), whose sum is σ = 297867983040. Its totient is φ = 132499883520.

The previous prime is 211011210019. The next prime is 211011210043. The reversal of 211011210021 is 120012110112.

It is not a de Polignac number, because 211011210021 - 2¹ = 211011210019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211011209979 and 211011210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211011210071) 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, 10689420 + ... + 10709141.

It is an arithmetic number, because the mean of its divisors is an integer number (18616748940).

Almost surely, 2^211011210021 is an apocalyptic number.

It is an amenable number.

211011210021 is a deficient number, since it is larger than the sum of its proper divisors (86856773019).

211011210021 is a wasteful number, since it uses less digits than its factorization.

211011210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21398756.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211011210021 its reverse (120012110112), we get a palindrome (331023320133).

Subtracting from 211011210021 its reverse (120012110112), we obtain a palindrome (90999099909).

The spelling of 211011210021 in words is "two hundred eleven billion, eleven million, two hundred ten thousand, twenty-one".