211450101221 has 2 divisors, whose sum is σ = 211450101222.
Its totient is φ = 211450101220.
The previous prime is 211450101209. The next prime is 211450101251. The reversal of 211450101221 is 122101054112.
Adding to 211450101221 its reverse (122101054112), we get a palindrome (333551155333).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 155739940321 + 55710160900 = 394639^2 + 236030^2
It is a cyclic number.
It is not a de Polignac number, because 211450101221 - 226 = 211382992357 is a prime.
It is a super-2 number, since 2×2114501012212 (a number of 23 digits) contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 211450101193 and 211450101202.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (211450101251) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105725050610 + 105725050611.
It is an arithmetic number, because the mean of its divisors is an integer number (105725050611).
Almost surely, 2211450101221 is an apocalyptic number.
It is an amenable number.
211450101221 is a deficient number, since it is larger than the sum of its proper divisors (1).
211450101221 is an equidigital number, since it uses as much as digits as its factorization.
211450101221 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 160, while the sum is 20.
The spelling of 211450101221 in words is "two hundred eleven billion, four hundred fifty million, one hundred one thousand, two hundred twenty-one".