1001211210021 has 16 divisors (see below), whose sum is σ = 1495666870848. Its totient is φ = 590394816000.

The previous prime is 1001211209983. The next prime is 1001211210053. The reversal of 1001211210021 is 1200121121001.

1001211210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1001211210021 - 2³⁴ = 984031340837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001211209979 and 1001211210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211210721) 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, 409995180 + ... + 409997621.

It is an arithmetic number, because the mean of its divisors is an integer number (93479179428).

Almost surely, 2^{1001211210021} is an apocalyptic number.

1001211210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001211210021 is a deficient number, since it is larger than the sum of its proper divisors (494455660827).

1001211210021 is a wasteful number, since it uses less digits than its factorization.

1001211210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819992852.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001211210021 its reverse (1200121121001), we get a palindrome (2201332331022).

The spelling of 1001211210021 in words is "one trillion, one billion, two hundred eleven million, two hundred ten thousand, twenty-one".