218021110477 has 2 divisors, whose sum is σ = 218021110478. Its totient is φ = 218021110476.

The previous prime is 218021110441. The next prime is 218021110493. The reversal of 218021110477 is 774011120812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117553665321 + 100467445156 = 342861^2 + 316966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218021110477 is a prime.

It is a super-2 number, since 2×218021110477² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218021110427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109010555238 + 109010555239.

It is an arithmetic number, because the mean of its divisors is an integer number (109010555239).

Almost surely, 2^218021110477 is an apocalyptic number.

It is an amenable number.

218021110477 is a deficient number, since it is larger than the sum of its proper divisors (1).

218021110477 is an equidigital number, since it uses as much as digits as its factorization.

218021110477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 34.

The spelling of 218021110477 in words is "two hundred eighteen billion, twenty-one million, one hundred ten thousand, four hundred seventy-seven".