211211112021021 has 48 divisors (see below), whose sum is σ = 352122083284608. Its totient is φ = 119495741616000.

The previous prime is 211211112020999. The next prime is 211211112021113. The reversal of 211211112021021 is 120120211112112.

It is a happy number.

211211112021021 is a `hidden beast` number, since 211 + 211 + 1 + 12 + 0 + 210 + 21 = 666.

It is not a de Polignac number, because 211211112021021 - 2²³ = 211211103632413 is a prime.

It is a super-2 number, since 2×211211112021021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211211112020985 and 211211112021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211112021121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 906910131 + ... + 907142991.

It is an arithmetic number, because the mean of its divisors is an integer number (7335876735096).

Almost surely, 2^{211211112021021} is an apocalyptic number.

211211112021021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211211112021021 is a deficient number, since it is larger than the sum of its proper divisors (140910971263587).

211211112021021 is a wasteful number, since it uses less digits than its factorization.

211211112021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375522 (or 375519 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 211211112021021 its reverse (120120211112112), we get a palindrome (331331323133133).

The spelling of 211211112021021 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred twelve million, twenty-one thousand, twenty-one".