1001211212021 has 8 divisors (see below), whose sum is σ = 1013391691200. Its totient is φ = 989033535232.

The previous prime is 1001211211999. The next prime is 1001211212039. The reversal of 1001211212021 is 1202121121001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001211212021 - 2³⁴ = 984031342837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001211211987 and 1001211212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211242021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22805 + ... + 1415253.

It is an arithmetic number, because the mean of its divisors is an integer number (126673961400).

Almost surely, 2^{1001211212021} is an apocalyptic number.

It is an amenable number.

1001211212021 is a deficient number, since it is larger than the sum of its proper divisors (12180479179).

1001211212021 is an equidigital number, since it uses as much as digits as its factorization.

1001211212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401195.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001211212021 its reverse (1202121121001), we get a palindrome (2203332333022).

The spelling of 1001211212021 in words is "one trillion, one billion, two hundred eleven million, two hundred twelve thousand, twenty-one".