20021220111001 has 8 divisors (see below), whose sum is σ = 20037300544800. Its totient is φ = 20005145481600.

The previous prime is 20021220110963. The next prime is 20021220111017. The reversal of 20021220111001 is 10011102212002.

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 20021220111001 - 2⁴³ = 11225127088793 is a prime.

It is a super-2 number, since 2×20021220111001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021220111301) 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, 5463526 + ... + 8360176.

It is an arithmetic number, because the mean of its divisors is an integer number (2504662568100).

Almost surely, 2^{20021220111001} is an apocalyptic number.

It is an amenable number.

20021220111001 is a deficient number, since it is larger than the sum of its proper divisors (16080433799).

20021220111001 is a wasteful number, since it uses less digits than its factorization.

20021220111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902199.

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

Adding to 20021220111001 its reverse (10011102212002), we get a palindrome (30032322323003).

It can be divided in two parts, 20021 and 220111001, that added together give a palindrome (220131022).

The spelling of 20021220111001 in words is "twenty trillion, twenty-one billion, two hundred twenty million, one hundred eleven thousand, one".