101210640493 has 4 divisors (see below), whose sum is σ = 101233789308. Its totient is φ = 101187491680.

The previous prime is 101210640469. The next prime is 101210640497. The reversal of 101210640493 is 394046012101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71351491689 + 29859148804 = 267117^2 + 172798^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101210640493 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 (101210640497) 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, 11567848 + ... + 11576593.

It is an arithmetic number, because the mean of its divisors is an integer number (25308447327).

Almost surely, 2^101210640493 is an apocalyptic number.

It is an amenable number.

101210640493 is a deficient number, since it is larger than the sum of its proper divisors (23148815).

101210640493 is an equidigital number, since it uses as much as digits as its factorization.

101210640493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23148814.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 101210640493 its reverse (394046012101), we get a palindrome (495256652594).

The spelling of 101210640493 in words is "one hundred one billion, two hundred ten million, six hundred forty thousand, four hundred ninety-three".