211213553 has 2 divisors, whose sum is σ = 211213554. Its totient is φ = 211213552.

The previous prime is 211213543. The next prime is 211213567. The reversal of 211213553 is 355312112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164660224 + 46553329 = 12832^2 + 6823^2 .

It is a cyclic number.

It is not a de Polignac number, because 211213553 - 2⁸ = 211213297 is a prime.

It is a super-2 number, since 2×211213553² = 89222329941767618, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (211213543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606776 + 105606777.

It is an arithmetic number, because the mean of its divisors is an integer number (105606777).

Almost surely, 2^211213553 is an apocalyptic number.

It is an amenable number.

211213553 is a deficient number, since it is larger than the sum of its proper divisors (1).

211213553 is an equidigital number, since it uses as much as digits as its factorization.

211213553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 23.

The square root of 211213553 is about 14533.1879847472. The cubic root of 211213553 is about 595.5349594076.

Adding to 211213553 its reverse (355312112), we get a palindrome (566525665).

The spelling of 211213553 in words is "two hundred eleven million, two hundred thirteen thousand, five hundred fifty-three".