211654228553 has 2 divisors, whose sum is σ = 211654228554. Its totient is φ = 211654228552.

The previous prime is 211654228519. The next prime is 211654228561. The reversal of 211654228553 is 355822456112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144714050569 + 66940177984 = 380413^2 + 258728^2 .

It is a cyclic number.

It is not a de Polignac number, because 211654228553 - 2¹⁰ = 211654227529 is a prime.

It is not a weakly prime, because it can be changed into another prime (211654224553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105827114276 + 105827114277.

It is an arithmetic number, because the mean of its divisors is an integer number (105827114277).

Almost surely, 2^211654228553 is an apocalyptic number.

It is an amenable number.

211654228553 is a deficient number, since it is larger than the sum of its proper divisors (1).

211654228553 is an equidigital number, since it uses as much as digits as its factorization.

211654228553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576000, while the sum is 44.

The spelling of 211654228553 in words is "two hundred eleven billion, six hundred fifty-four million, two hundred twenty-eight thousand, five hundred fifty-three".