20001021212001 has 8 divisors (see below), whose sum is σ = 27171198627840. Its totient is φ = 13082428968752.

The previous prime is 20001021211673. The next prime is 20001021212017. The reversal of 20001021212001 is 10021212010002.

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 20001021212001 - 2⁹ = 20001021211489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001021212071) 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, 62896292961 + ... + 62896293278.

It is an arithmetic number, because the mean of its divisors is an integer number (3396399828480).

Almost surely, 2^{20001021212001} is an apocalyptic number.

It is an amenable number.

20001021212001 is a deficient number, since it is larger than the sum of its proper divisors (7170177415839).

20001021212001 is a wasteful number, since it uses less digits than its factorization.

20001021212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125792586295.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001021212001 its reverse (10021212010002), we get a palindrome (30022233222003).

The spelling of 20001021212001 in words is "twenty trillion, one billion, twenty-one million, two hundred twelve thousand, one".