20021121011001 has 64 divisors (see below), whose sum is σ = 29934949254912. Its totient is φ = 11799984000000.

The previous prime is 20021121010981. The next prime is 20021121011011. The reversal of 20021121011001 is 10011012112002.

It is not a de Polignac number, because 20021121011001 - 2¹¹ = 20021121008953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021121011011) 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 63 ways as a sum of consecutive naturals, for example, 142452175 + ... + 142592651.

It is an arithmetic number, because the mean of its divisors is an integer number (467733582108).

Almost surely, 2^{20021121011001} is an apocalyptic number.

It is an amenable number.

20021121011001 is a deficient number, since it is larger than the sum of its proper divisors (9913828243911).

20021121011001 is a wasteful number, since it uses less digits than its factorization.

20021121011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141354.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20021121011001 its reverse (10011012112002), we get a palindrome (30032133123003).

It can be divided in two parts, 200211 and 21011001, that added together give a palindrome (21211212).

The spelling of 20021121011001 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, eleven thousand, one".