20010021001001 has 8 divisors (see below), whose sum is σ = 20880289991040. Its totient is φ = 19139774350752.

The previous prime is 20010021000961. The next prime is 20010021001039. The reversal of 20010021001001 is 10010012001002.

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

It is a cyclic number.

It is not a de Polignac number, because 20010021001001 - 2⁴² = 15611974489897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20010021001001.

It is not an unprimeable number, because it can be changed into a prime (20010021001601) 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, 3741620 + ... + 7349813.

It is an arithmetic number, because the mean of its divisors is an integer number (2610036248880).

Almost surely, 2^{20010021001001} is an apocalyptic number.

It is an amenable number.

20010021001001 is a deficient number, since it is larger than the sum of its proper divisors (870268990039).

20010021001001 is a wasteful number, since it uses less digits than its factorization.

20010021001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11169895.

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

Adding to 20010021001001 its reverse (10010012001002), we get a palindrome (30020033002003).

It can be divided in two parts, 2001002 and 1001001, that multiplied together give a palindrome (2003005003002).

The spelling of 20010021001001 in words is "twenty trillion, ten billion, twenty-one million, one thousand, one".