100522021 has 2 divisors, whose sum is σ = 100522022. Its totient is φ = 100522020.

The previous prime is 100522001. The next prime is 100522031. The reversal of 100522021 is 120225001.

100522021 = 7089² + 7090².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 50253921 = 7090^2 + 7089^2 .

It is a cyclic number.

It is not a de Polignac number, because 100522021 - 2⁷ = 100521893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100521992 and 100522010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100522001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50261010 + 50261011.

It is an arithmetic number, because the mean of its divisors is an integer number (50261011).

Almost surely, 2^100522021 is an apocalyptic number.

100522021 is the 7090-th centered square number.

It is an amenable number.

100522021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100522021 is an equidigital number, since it uses as much as digits as its factorization.

100522021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 100522021 is about 10026.0670753791. The cubic root of 100522021 is about 464.9651509706.

Adding to 100522021 its reverse (120225001), we get a palindrome (220747022).

The spelling of 100522021 in words is "one hundred million, five hundred twenty-two thousand, twenty-one".