10001021210021 has 2 divisors, whose sum is σ = 10001021210022. Its totient is φ = 10001021210020.

The previous prime is 10001021209957. The next prime is 10001021210027. The reversal of 10001021210021 is 12001212010001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8071769659396 + 1929251550625 = 2841086^2 + 1388975^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001021210021 - 2⁶ = 10001021209957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10001021209984 and 10001021210011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10001021210027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000510605010 + 5000510605011.

It is an arithmetic number, because the mean of its divisors is an integer number (5000510605011).

Almost surely, 2^{10001021210021} is an apocalyptic number.

It is an amenable number.

10001021210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001021210021 is an equidigital number, since it uses as much as digits as its factorization.

10001021210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10001021210021 its reverse (12001212010001), we get a palindrome (22002233220022).

The spelling of 10001021210021 in words is "ten trillion, one billion, twenty-one million, two hundred ten thousand, twenty-one".