101210404021 has 2 divisors, whose sum is σ = 101210404022. Its totient is φ = 101210404020.

The previous prime is 101210404013. The next prime is 101210404037. The reversal of 101210404021 is 120404012101.

It is a happy number.

It is an a-pointer prime, because the next prime (101210404037) can be obtained adding 101210404021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82745399025 + 18465004996 = 287655^2 + 135886^2 .

It is a cyclic number.

It is not a de Polignac number, because 101210404021 - 2³ = 101210404013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101210403986 and 101210404004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101210404121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50605202010 + 50605202011.

It is an arithmetic number, because the mean of its divisors is an integer number (50605202011).

Almost surely, 2^101210404021 is an apocalyptic number.

It is an amenable number.

101210404021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101210404021 is an equidigital number, since it uses as much as digits as its factorization.

101210404021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 101210404021 its reverse (120404012101), we get a palindrome (221614416122).

The spelling of 101210404021 in words is "one hundred one billion, two hundred ten million, four hundred four thousand, twenty-one".