20021201002001 has 8 divisors (see below), whose sum is σ = 20959739110464. Its totient is φ = 19088333819280.

The previous prime is 20021201001979. The next prime is 20021201002027. The reversal of 20021201002001 is 10020010212002.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-20021201002001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021201002031) 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, 1417724210 + ... + 1417738331.

It is an arithmetic number, because the mean of its divisors is an integer number (2619967388808).

Almost surely, 2^{20021201002001} is an apocalyptic number.

It is an amenable number.

20021201002001 is a deficient number, since it is larger than the sum of its proper divisors (938538108463).

20021201002001 is a wasteful number, since it uses less digits than its factorization.

20021201002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835462871.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021201002001 its reverse (10020010212002), we get a palindrome (30041211214003).

The spelling of 20021201002001 in words is "twenty trillion, twenty-one billion, two hundred one million, two thousand, one".