20011221210001 has 8 divisors (see below), whose sum is σ = 23864313492864. Its totient is φ = 16406715526080.

The previous prime is 20011221209957. The next prime is 20011221210007. The reversal of 20011221210001 is 10001212211002.

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 20011221210001 - 2²³ = 20011212821393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011221210007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62146649560 + ... + 62146649881.

It is an arithmetic number, because the mean of its divisors is an integer number (2983039186608).

Almost surely, 2^{20011221210001} is an apocalyptic number.

It is an amenable number.

20011221210001 is a deficient number, since it is larger than the sum of its proper divisors (3853092282863).

20011221210001 is a wasteful number, since it uses less digits than its factorization.

20011221210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124293299471.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20011221210001 its reverse (10001212211002), we get a palindrome (30012433421003).

It can be divided in two parts, 2001122 and 1210001, that added together give a palindrome (3211123).

The spelling of 20011221210001 in words is "twenty trillion, eleven billion, two hundred twenty-one million, two hundred ten thousand, one".