211211120212121 has 16 divisors (see below), whose sum is σ = 219311107013376. Its totient is φ = 203266594800000.

The previous prime is 211211120212111. The next prime is 211211120212129. The reversal of 211211120212121 is 121212021112112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211211120212121 - 2⁴⁶ = 140842376034457 is a prime.

It is a super-2 number, since 2×211211120212121² (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 = 211211120212093 and 211211120212102.

It is not an unprimeable number, because it can be changed into a prime (211211120212129) 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, 92982695 + ... + 95227116.

It is an arithmetic number, because the mean of its divisors is an integer number (13706944188336).

Almost surely, 2^{211211120212121} is an apocalyptic number.

It is an amenable number.

211211120212121 is a deficient number, since it is larger than the sum of its proper divisors (8099986801255).

211211120212121 is a wasteful number, since it uses less digits than its factorization.

211211120212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188210224.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211211120212121 its reverse (121212021112112), we get a palindrome (332423141324233).

The spelling of 211211120212121 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred twenty million, two hundred twelve thousand, one hundred twenty-one".