211020211120021 has 16 divisors (see below), whose sum is σ = 221517898850304. Its totient is φ = 200632812337584.

The previous prime is 211020211120003. The next prime is 211020211120079. The reversal of 211020211120021 is 120021112020112.

It is not a de Polignac number, because 211020211120021 - 2²⁷ = 211020076902293 is a prime.

It is a super-2 number, since 2×211020211120021² (a number of 29 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 = 211020211119977 and 211020211120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020211180021) 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, 204621946 + ... + 205650628.

It is an arithmetic number, because the mean of its divisors is an integer number (13844868678144).

Almost surely, 2^{211020211120021} is an apocalyptic number.

It is an amenable number.

211020211120021 is a deficient number, since it is larger than the sum of its proper divisors (10497687730283).

211020211120021 is a wasteful number, since it uses less digits than its factorization.

211020211120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082280.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211020211120021 its reverse (120021112020112), we get a palindrome (331041323140133).

Subtracting from 211020211120021 its reverse (120021112020112), we obtain a palindrome (90999099099909).

The spelling of 211020211120021 in words is "two hundred eleven trillion, twenty billion, two hundred eleven million, one hundred twenty thousand, twenty-one".