1021021111001 has 16 divisors (see below), whose sum is σ = 1117811939328. Its totient is φ = 928414656000.

The previous prime is 1021021110979. The next prime is 1021021111003. The reversal of 1021021111001 is 1001111201201.

It is a cyclic number.

It is not a de Polignac number, because 1021021111001 - 2²⁶ = 1020954002137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021021111003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295105 + ... + 1928558.

It is an arithmetic number, because the mean of its divisors is an integer number (69863246208).

Almost surely, 2^{1021021111001} is an apocalyptic number.

It is an amenable number.

1021021111001 is a deficient number, since it is larger than the sum of its proper divisors (96790828327).

1021021111001 is a wasteful number, since it uses less digits than its factorization.

1021021111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3224312.

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

Adding to 1021021111001 its reverse (1001111201201), we get a palindrome (2022132312202).

The spelling of 1021021111001 in words is "one trillion, twenty-one billion, twenty-one million, one hundred eleven thousand, one".