2101221400177 has 2 divisors, whose sum is σ = 2101221400178. Its totient is φ = 2101221400176.

The previous prime is 2101221400139. The next prime is 2101221400259. The reversal of 2101221400177 is 7710041221012.

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., 2085875393536 + 15346006641 = 1444256^2 + 123879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101221400177 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101221400777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050610700088 + 1050610700089.

It is an arithmetic number, because the mean of its divisors is an integer number (1050610700089).

Almost surely, 2^{2101221400177} is an apocalyptic number.

It is an amenable number.

2101221400177 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101221400177 is an equidigital number, since it uses as much as digits as its factorization.

2101221400177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 2101221400177 its reverse (7710041221012), we get a palindrome (9811262621189).

The spelling of 2101221400177 in words is "two trillion, one hundred one billion, two hundred twenty-one million, four hundred thousand, one hundred seventy-seven".