10010220121721 has 2 divisors, whose sum is σ = 10010220121722. Its totient is φ = 10010220121720.

The previous prime is 10010220121697. The next prime is 10010220121739. The reversal of 10010220121721 is 12712102201001.

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., 8503120152121 + 1507099969600 = 2916011^2 + 1227640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10010220121721 is a prime.

It is a super-3 number, since 3×10010220121721³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10010220121693 and 10010220121702.

It is not a weakly prime, because it can be changed into another prime (10010220121751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005110060860 + 5005110060861.

It is an arithmetic number, because the mean of its divisors is an integer number (5005110060861).

Almost surely, 2^{10010220121721} is an apocalyptic number.

It is an amenable number.

10010220121721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10010220121721 is an equidigital number, since it uses as much as digits as its factorization.

10010220121721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 10010220121721 its reverse (12712102201001), we get a palindrome (22722322322722).

The spelling of 10010220121721 in words is "ten trillion, ten billion, two hundred twenty million, one hundred twenty-one thousand, seven hundred twenty-one".