1011021002001 has 12 divisors (see below), whose sum is σ = 1460705650560. Its totient is φ = 673856163960.

The previous prime is 1011021001993. The next prime is 1011021002009. The reversal of 1011021002001 is 1002001201101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1011021001993) and next prime (1011021002009).

It is not a de Polignac number, because 1011021002001 - 2³ = 1011021001993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1011021002009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13112541 + ... + 13189418.

It is an arithmetic number, because the mean of its divisors is an integer number (121725470880).

Almost surely, 2^{1011021002001} is an apocalyptic number.

It is an amenable number.

1011021002001 is a deficient number, since it is larger than the sum of its proper divisors (449684648559).

1011021002001 is a wasteful number, since it uses less digits than its factorization.

1011021002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26306236 (or 26306233 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1011021002001 its reverse (1002001201101), we get a palindrome (2013022203102).

The spelling of 1011021002001 in words is "one trillion, eleven billion, twenty-one million, two thousand, one".