100021121 has 2 divisors, whose sum is σ = 100021122. Its totient is φ = 100021120.

The previous prime is 100021093. The next prime is 100021127. The reversal of 100021121 is 121120001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58599025 + 41422096 = 7655^2 + 6436^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021121 - 2¹⁸ = 99758977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100021099 and 100021108.

It is not a weakly prime, because it can be changed into another prime (100021127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010560 + 50010561.

It is an arithmetic number, because the mean of its divisors is an integer number (50010561).

Almost surely, 2^100021121 is an apocalyptic number.

It is an amenable number.

100021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021121 is an equidigital number, since it uses as much as digits as its factorization.

100021121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 100021121 is about 10001.0559942438. The cubic root of 100021121 is about 464.1915593935.

Adding to 100021121 its reverse (121120001), we get a palindrome (221141122).

The spelling of 100021121 in words is "one hundred million, twenty-one thousand, one hundred twenty-one".