100221020212421 has 2 divisors, whose sum is σ = 100221020212422. Its totient is φ = 100221020212420.

The previous prime is 100221020212351. The next prime is 100221020212477. The reversal of 100221020212421 is 124212020122001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64447403191396 + 35773617021025 = 8027914^2 + 5981105^2 .

It is a cyclic number.

It is not a de Polignac number, because 100221020212421 - 2¹⁰ = 100221020211397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100221020212393 and 100221020212402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100221020212921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50110510106210 + 50110510106211.

It is an arithmetic number, because the mean of its divisors is an integer number (50110510106211).

Almost surely, 2^{100221020212421} is an apocalyptic number.

It is an amenable number.

100221020212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100221020212421 is an equidigital number, since it uses as much as digits as its factorization.

100221020212421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 100221020212421 its reverse (124212020122001), we get a palindrome (224433040334422).

The spelling of 100221020212421 in words is "one hundred trillion, two hundred twenty-one billion, twenty million, two hundred twelve thousand, four hundred twenty-one".