221130212977 has 2 divisors, whose sum is σ = 221130212978. Its totient is φ = 221130212976.

The previous prime is 221130212971. The next prime is 221130213019. The reversal of 221130212977 is 779212031122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213731460721 + 7398752256 = 462311^2 + 86016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221130212977 is a prime.

It is not a weakly prime, because it can be changed into another prime (221130212971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110565106488 + 110565106489.

It is an arithmetic number, because the mean of its divisors is an integer number (110565106489).

Almost surely, 2^221130212977 is an apocalyptic number.

It is an amenable number.

221130212977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221130212977 is an equidigital number, since it uses as much as digits as its factorization.

221130212977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The spelling of 221130212977 in words is "two hundred twenty-one billion, one hundred thirty million, two hundred twelve thousand, nine hundred seventy-seven".