1011001010021 has 2 divisors, whose sum is σ = 1011001010022. Its totient is φ = 1011001010020.

The previous prime is 1011001009969. The next prime is 1011001010027. The reversal of 1011001010021 is 1200101001101.

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., 1007184859396 + 3816150625 = 1003586^2 + 61775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011001010021 - 2⁶ = 1011001009957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011001009990 and 1011001010008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011001010027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505500505010 + 505500505011.

It is an arithmetic number, because the mean of its divisors is an integer number (505500505011).

Almost surely, 2^{1011001010021} is an apocalyptic number.

It is an amenable number.

1011001010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011001010021 is an equidigital number, since it uses as much as digits as its factorization.

1011001010021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1011001010021 its reverse (1200101001101), we get a palindrome (2211102011122).

The spelling of 1011001010021 in words is "one trillion, eleven billion, one million, ten thousand, twenty-one".