101020421 has 2 divisors, whose sum is σ = 101020422. Its totient is φ = 101020420.

The previous prime is 101020411. The next prime is 101020441. The reversal of 101020421 is 124020101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53217025 + 47803396 = 7295^2 + 6914^2 .

It is an emirp because it is prime and its reverse (124020101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101020421 - 2⁶ = 101020357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101020411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50510210 + 50510211.

It is an arithmetic number, because the mean of its divisors is an integer number (50510211).

Almost surely, 2^101020421 is an apocalyptic number.

It is an amenable number.

101020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

101020421 is an equidigital number, since it uses as much as digits as its factorization.

101020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 101020421 is about 10050.8915524942. The cubic root of 101020421 is about 465.7323350650.

Adding to 101020421 its reverse (124020101), we get a palindrome (225040522).

The spelling of 101020421 in words is "one hundred one million, twenty thousand, four hundred twenty-one".