1001100551021 has 2 divisors, whose sum is σ = 1001100551022. Its totient is φ = 1001100551020.

The previous prime is 1001100550993. The next prime is 1001100551027. The reversal of 1001100551021 is 1201550011001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923019426121 + 78081124900 = 960739^2 + 279430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001100551021 - 2²² = 1001096356717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001100551027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500550275510 + 500550275511.

It is an arithmetic number, because the mean of its divisors is an integer number (500550275511).

Almost surely, 2^{1001100551021} is an apocalyptic number.

It is an amenable number.

1001100551021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001100551021 is an equidigital number, since it uses as much as digits as its factorization.

1001100551021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50, while the sum is 17.

Adding to 1001100551021 its reverse (1201550011001), we get a palindrome (2202650562022).

The spelling of 1001100551021 in words is "one trillion, one billion, one hundred million, five hundred fifty-one thousand, twenty-one".