21220120020001 has 8 divisors (see below), whose sum is σ = 24276644923520. Its totient is φ = 18169864913088.

The previous prime is 21220120019977. The next prime is 21220120020013. The reversal of 21220120020001 is 10002002102212.

It is a happy number.

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

It is not a de Polignac number, because 21220120020001 - 2¹⁹ = 21220119495713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220120020101) 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, 1567441896 + ... + 1567455433.

It is an arithmetic number, because the mean of its divisors is an integer number (3034580615440).

Almost surely, 2^{21220120020001} is an apocalyptic number.

It is an amenable number.

21220120020001 is a deficient number, since it is larger than the sum of its proper divisors (3056524903519).

21220120020001 is an equidigital number, since it uses as much as digits as its factorization.

21220120020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134898303.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220120020001 its reverse (10002002102212), we get a palindrome (31222122122213).

The spelling of 21220120020001 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, twenty thousand, one".