100521100144021 has 4 divisors (see below), whose sum is σ = 101497033155232. Its totient is φ = 99545167132812.

The previous prime is 100521100143913. The next prime is 100521100144081. The reversal of 100521100144021 is 120441001125001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100521100144021 - 2²⁵ = 100521066589589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100521100143983 and 100521100144001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100521100144081) 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, 487966505451 + ... + 487966505656.

It is an arithmetic number, because the mean of its divisors is an integer number (25374258288808).

Almost surely, 2^{100521100144021} is an apocalyptic number.

It is an amenable number.

100521100144021 is a deficient number, since it is larger than the sum of its proper divisors (975933011211).

100521100144021 is an equidigital number, since it uses as much as digits as its factorization.

100521100144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975933011210.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 100521100144021 its reverse (120441001125001), we get a palindrome (220962101269022).

The spelling of 100521100144021 in words is "one hundred trillion, five hundred twenty-one billion, one hundred million, one hundred forty-four thousand, twenty-one".