101620570721 has 2 divisors, whose sum is σ = 101620570722. Its totient is φ = 101620570720.

The previous prime is 101620570687. The next prime is 101620570747. The reversal of 101620570721 is 127075026101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59075733025 + 42544837696 = 243055^2 + 206264^2 .

It is an emirp because it is prime and its reverse (127075026101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101620570721 is a prime.

It is not a weakly prime, because it can be changed into another prime (107620570721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50810285360 + 50810285361.

It is an arithmetic number, because the mean of its divisors is an integer number (50810285361).

Almost surely, 2^101620570721 is an apocalyptic number.

It is an amenable number.

101620570721 is a deficient number, since it is larger than the sum of its proper divisors (1).

101620570721 is an equidigital number, since it uses as much as digits as its factorization.

101620570721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 32.

Adding to 101620570721 its reverse (127075026101), we get a palindrome (228695596822).

The spelling of 101620570721 in words is "one hundred one billion, six hundred twenty million, five hundred seventy thousand, seven hundred twenty-one".