1002111211021 has 4 divisors (see below), whose sum is σ = 1002114847072. Its totient is φ = 1002107574972.

The previous prime is 1002111211009. The next prime is 1002111211033. The reversal of 1002111211021 is 1201121112001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1002111211009) and next prime (1002111211033).

It is a cyclic number.

It is not a de Polignac number, because 1002111211021 - 2¹⁵ = 1002111178253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002111210992 and 1002111211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002111211001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1367385 + ... + 1968238.

It is an arithmetic number, because the mean of its divisors is an integer number (250528711768).

Almost surely, 2^{1002111211021} is an apocalyptic number.

It is an amenable number.

1002111211021 is a deficient number, since it is larger than the sum of its proper divisors (3636051).

1002111211021 is an equidigital number, since it uses as much as digits as its factorization.

1002111211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636050.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1002111211021 its reverse (1201121112001), we get a palindrome (2203232323022).

The spelling of 1002111211021 in words is "one trillion, two billion, one hundred eleven million, two hundred eleven thousand, twenty-one".