401021001001 has 4 divisors (see below), whose sum is σ = 401024438100. Its totient is φ = 401017563904.

The previous prime is 401021000969. The next prime is 401021001091. The reversal of 401021001001 is 100100120104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148563993600 + 252457007401 = 385440^2 + 502451^2 .

It is a cyclic number.

It is not a de Polignac number, because 401021001001 - 2⁵ = 401021000969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401021001091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537156 + ... + 1779013.

It is an arithmetic number, because the mean of its divisors is an integer number (100256109525).

Almost surely, 2^401021001001 is an apocalyptic number.

It is an amenable number.

401021001001 is a deficient number, since it is larger than the sum of its proper divisors (3437099).

401021001001 is a wasteful number, since it uses less digits than its factorization.

401021001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3437098.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 401021001001 its reverse (100100120104), we get a palindrome (501121121105).

The spelling of 401021001001 in words is "four hundred one billion, twenty-one million, one thousand, one".