101543021 has 2 divisors, whose sum is σ = 101543022. Its totient is φ = 101543020.

The previous prime is 101543017. The next prime is 101543027. The reversal of 101543021 is 120345101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60762025 + 40780996 = 7795^2 + 6386^2 .

It is a cyclic number.

It is not a de Polignac number, because 101543021 - 2² = 101543017 is a prime.

It is a super-2 number, since 2×101543021² = 20621970227612882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101543027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50771510 + 50771511.

It is an arithmetic number, because the mean of its divisors is an integer number (50771511).

Almost surely, 2^101543021 is an apocalyptic number.

It is an amenable number.

101543021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101543021 is an equidigital number, since it uses as much as digits as its factorization.

101543021 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 17.

The square root of 101543021 is about 10076.8557099921. The cubic root of 101543021 is about 466.5340647628.

Adding to 101543021 its reverse (120345101), we get a palindrome (221888122).

The spelling of 101543021 in words is "one hundred one million, five hundred forty-three thousand, twenty-one".