1021000120001 has 8 divisors (see below), whose sum is σ = 1031578821000. Its totient is φ = 1010422499328.

The previous prime is 1021000119983. The next prime is 1021000120003. The reversal of 1021000120001 is 1000210001201.

It can be written as a sum of positive squares in 4 ways, for example, as 1306099600 + 1019694020401 = 36140^2 + 1009799^2 .

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-1021000120001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021000120003) 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, 1704245 + ... + 2224061.

It is an arithmetic number, because the mean of its divisors is an integer number (128947352625).

Almost surely, 2^{1021000120001} is an apocalyptic number.

It is an amenable number.

1021000120001 is a deficient number, since it is larger than the sum of its proper divisors (10578700999).

1021000120001 is an equidigital number, since it uses as much as digits as its factorization.

1021000120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540163.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1021000120001 its reverse (1000210001201), we get a palindrome (2021210121202).

The spelling of 1021000120001 in words is "one trillion, twenty-one billion, one hundred twenty thousand, one".