1001212122021 has 16 divisors (see below), whose sum is σ = 1393199671680. Its totient is φ = 638358364160.

The previous prime is 1001212122011. The next prime is 1001212122059. The reversal of 1001212122021 is 1202212121001.

1001212122021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1001212122021 - 2⁵ = 1001212121989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001212122011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623100 + ... + 1546181.

It is an arithmetic number, because the mean of its divisors is an integer number (87074979480).

Almost surely, 2^{1001212122021} is an apocalyptic number.

It is an amenable number.

1001212122021 is a deficient number, since it is larger than the sum of its proper divisors (391987549659).

1001212122021 is a wasteful number, since it uses less digits than its factorization.

1001212122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175996.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1001212122021 its reverse (1202212121001), we get a palindrome (2203424243022).

The spelling of 1001212122021 in words is "one trillion, one billion, two hundred twelve million, one hundred twenty-two thousand, twenty-one".