211211112010421 has 2 divisors, whose sum is σ = 211211112010422. Its totient is φ = 211211112010420.

The previous prime is 211211112010411. The next prime is 211211112010439. The reversal of 211211112010421 is 124010211112112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157433984452900 + 53777127557521 = 12547270^2 + 7333289^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211112010421 - 2³⁰ = 211210038268597 is a prime.

It is a super-2 number, since 2×211211112010421² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211211112010393 and 211211112010402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211211112010411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605556005210 + 105605556005211.

It is an arithmetic number, because the mean of its divisors is an integer number (105605556005211).

Almost surely, 2^{211211112010421} is an apocalyptic number.

It is an amenable number.

211211112010421 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211112010421 is an equidigital number, since it uses as much as digits as its factorization.

211211112010421 is an evil number, because the sum of its binary digits is even.

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

Adding to 211211112010421 its reverse (124010211112112), we get a palindrome (335221323122533).

The spelling of 211211112010421 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred twelve million, ten thousand, four hundred twenty-one".