1001212002121 has 4 divisors (see below), whose sum is σ = 1001219079700. Its totient is φ = 1001204924544.

The previous prime is 1001212002079. The next prime is 1001212002139. The reversal of 1001212002121 is 1212002121001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 923836234896 + 77375767225 = 961164^2 + 278165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001212002121 - 2⁹ = 1001212001609 is a prime.

It is a super-2 number, since 2×1001212002121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001212302121) 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, 3322176 + ... + 3610993.

It is an arithmetic number, because the mean of its divisors is an integer number (250304769925).

Almost surely, 2^{1001212002121} is an apocalyptic number.

It is an amenable number.

1001212002121 is a deficient number, since it is larger than the sum of its proper divisors (7077579).

1001212002121 is an equidigital number, since it uses as much as digits as its factorization.

1001212002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077578.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1001212002121 its reverse (1212002121001), we get a palindrome (2213214123122).

The spelling of 1001212002121 in words is "one trillion, one billion, two hundred twelve million, two thousand, one hundred twenty-one".