100521403 has 2 divisors, whose sum is σ = 100521404. Its totient is φ = 100521402.

The previous prime is 100521397. The next prime is 100521413. The reversal of 100521403 is 304125001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100521403 - 2⁹ = 100520891 is a prime.

It is a super-2 number, since 2×100521403² = 20209104922176818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100521413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50260701 + 50260702.

It is an arithmetic number, because the mean of its divisors is an integer number (50260702).

Almost surely, 2^100521403 is an apocalyptic number.

100521403 is a deficient number, since it is larger than the sum of its proper divisors (1).

100521403 is an equidigital number, since it uses as much as digits as its factorization.

100521403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 100521403 is about 10026.0362556695. The cubic root of 100521403 is about 464.9641981146.

Adding to 100521403 its reverse (304125001), we get a palindrome (404646404).

The spelling of 100521403 in words is "one hundred million, five hundred twenty-one thousand, four hundred three".