100021393 has 2 divisors, whose sum is σ = 100021394. Its totient is φ = 100021392.

The previous prime is 100021379. The next prime is 100021399. The reversal of 100021393 is 393120001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97851664 + 2169729 = 9892^2 + 1473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100021393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100021393.

It is not a weakly prime, because it can be changed into another prime (100021399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010696 + 50010697.

It is an arithmetic number, because the mean of its divisors is an integer number (50010697).

Almost surely, 2^100021393 is an apocalyptic number.

It is an amenable number.

100021393 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021393 is an equidigital number, since it uses as much as digits as its factorization.

100021393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 100021393 is about 10001.0695927986. The cubic root of 100021393 is about 464.1919801712.

Adding to 100021393 its reverse (393120001), we get a palindrome (493141394).

The spelling of 100021393 in words is "one hundred million, twenty-one thousand, three hundred ninety-three".