100521121 has 2 divisors, whose sum is σ = 100521122. Its totient is φ = 100521120.

The previous prime is 100521103. The next prime is 100521137. The reversal of 100521121 is 121125001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99221521 + 1299600 = 9961^2 + 1140^2 .

It is an emirp because it is prime and its reverse (121125001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100521121 - 2⁵ = 100521089 is a prime.

It is not a weakly prime, because it can be changed into another prime (100021121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50260560 + 50260561.

It is an arithmetic number, because the mean of its divisors is an integer number (50260561).

Almost surely, 2^100521121 is an apocalyptic number.

It is an amenable number.

100521121 is a deficient number, since it is larger than the sum of its proper divisors (1).

100521121 is an equidigital number, since it uses as much as digits as its factorization.

100521121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 100521121 is about 10026.0221922755. The cubic root of 100521121 is about 464.9637633149.

Adding to 100521121 its reverse (121125001), we get a palindrome (221646122).

The spelling of 100521121 in words is "one hundred million, five hundred twenty-one thousand, one hundred twenty-one".