1021012111001 has 8 divisors (see below), whose sum is σ = 1024961636160. Its totient is φ = 1017063096592.

The previous prime is 1021012110893. The next prime is 1021012111117. The reversal of 1021012111001 is 1001112101201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021012111001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021012111501) 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, 4155110 + ... + 4393968.

It is an arithmetic number, because the mean of its divisors is an integer number (128120204520).

Almost surely, 2^{1021012111001} is an apocalyptic number.

It is an amenable number.

1021012111001 is a deficient number, since it is larger than the sum of its proper divisors (3949525159).

1021012111001 is a wasteful number, since it uses less digits than its factorization.

1021012111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255375.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1021012111001 its reverse (1001112101201), we get a palindrome (2022124212202).

The spelling of 1021012111001 in words is "one trillion, twenty-one billion, twelve million, one hundred eleven thousand, one".