101573365021 has 4 divisors (see below), whose sum is σ = 102620513212. Its totient is φ = 100526216832.

The previous prime is 101573364979. The next prime is 101573365051. The reversal of 101573365021 is 120563375101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120563375101 = 13 ⋅9274105777.

It can be written as a sum of positive squares in 2 ways, for example, as 14427372996 + 87145992025 = 120114^2 + 295205^2 .

It is a cyclic number.

It is not a de Polignac number, because 101573365021 - 2²¹ = 101571267869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101573365051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523573950 + ... + 523574143.

It is an arithmetic number, because the mean of its divisors is an integer number (25655128303).

Almost surely, 2^101573365021 is an apocalyptic number.

It is an amenable number.

101573365021 is a deficient number, since it is larger than the sum of its proper divisors (1047148191).

101573365021 is an equidigital number, since it uses as much as digits as its factorization.

101573365021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047148190.

The product of its (nonzero) digits is 18900, while the sum is 34.

The spelling of 101573365021 in words is "one hundred one billion, five hundred seventy-three million, three hundred sixty-five thousand, twenty-one".