172201002601021 has 2 divisors, whose sum is σ = 172201002601022. Its totient is φ = 172201002601020.

The previous prime is 172201002600959. The next prime is 172201002601039. The reversal of 172201002601021 is 120106200102271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171013447538521 + 1187555062500 = 13077211^2 + 1089750^2 .

It is an emirp because it is prime and its reverse (120106200102271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172201002601021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172201002611021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86100501300510 + 86100501300511.

It is an arithmetic number, because the mean of its divisors is an integer number (86100501300511).

Almost surely, 2^{172201002601021} is an apocalyptic number.

It is an amenable number.

172201002601021 is a deficient number, since it is larger than the sum of its proper divisors (1).

172201002601021 is an equidigital number, since it uses as much as digits as its factorization.

172201002601021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 172201002601021 its reverse (120106200102271), we get a palindrome (292307202703292).

The spelling of 172201002601021 in words is "one hundred seventy-two trillion, two hundred one billion, two million, six hundred one thousand, twenty-one".