1001231010021 has 16 divisors (see below), whose sum is σ = 1481019678720. Its totient is φ = 596521812720.

The previous prime is 1001231010007. The next prime is 1001231010023. The reversal of 1001231010021 is 1200101321001.

It is not a de Polignac number, because 1001231010021 - 2¹⁸ = 1001230747877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001231009979 and 1001231010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001231010023) 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, 257119525 + ... + 257123418.

It is an arithmetic number, because the mean of its divisors is an integer number (92563729920).

Almost surely, 2^{1001231010021} is an apocalyptic number.

1001231010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001231010021 is a deficient number, since it is larger than the sum of its proper divisors (479788668699).

1001231010021 is a wasteful number, since it uses less digits than its factorization.

1001231010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514243016.

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

Adding to 1001231010021 its reverse (1200101321001), we get a palindrome (2201332331022).

The spelling of 1001231010021 in words is "one trillion, one billion, two hundred thirty-one million, ten thousand, twenty-one".