221000201009977 has 2 divisors, whose sum is σ = 221000201009978. Its totient is φ = 221000201009976.

The previous prime is 221000201009933. The next prime is 221000201009981. The reversal of 221000201009977 is 779900102000122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160705923336256 + 60294277673721 = 12676984^2 + 7764939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000201009977 is a prime.

It is not a weakly prime, because it can be changed into another prime (221000201001977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500100504988 + 110500100504989.

It is an arithmetic number, because the mean of its divisors is an integer number (110500100504989).

Almost surely, 2^{221000201009977} is an apocalyptic number.

It is an amenable number.

221000201009977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000201009977 is an equidigital number, since it uses as much as digits as its factorization.

221000201009977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 40.

The spelling of 221000201009977 in words is "two hundred twenty-one trillion, two hundred one million, nine thousand, nine hundred seventy-seven".