1001213122021 has 8 divisors (see below), whose sum is σ = 1144354731264. Its totient is φ = 858099303600.

The previous prime is 1001213122001. The next prime is 1001213122043. The reversal of 1001213122021 is 1202213121001.

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

It is not a de Polignac number, because 1001213122021 - 2⁷ = 1001213121893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001213121986 and 1001213122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001213122001) 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, 6870445 + ... + 7014658.

It is an arithmetic number, because the mean of its divisors is an integer number (143044341408).

Almost surely, 2^{1001213122021} is an apocalyptic number.

It is an amenable number.

1001213122021 is a deficient number, since it is larger than the sum of its proper divisors (143141609243).

1001213122021 is a wasteful number, since it uses less digits than its factorization.

1001213122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13895411.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1001213122021 its reverse (1202213121001), we get a palindrome (2203426243022).

The spelling of 1001213122021 in words is "one trillion, one billion, two hundred thirteen million, one hundred twenty-two thousand, twenty-one".