20021220011001 has 32 divisors (see below), whose sum is σ = 29244965492736. Its totient is φ = 12082791384000.

The previous prime is 20021220010973. The next prime is 20021220011021. The reversal of 20021220011001 is 10011002212002.

It is not a de Polignac number, because 20021220011001 - 2¹⁴ = 20021219994617 is a prime.

It is a super-2 number, since 2×20021220011001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20021220011021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16041430 + ... + 17244416.

It is an arithmetic number, because the mean of its divisors is an integer number (913905171648).

Almost surely, 2^{20021220011001} is an apocalyptic number.

It is an amenable number.

20021220011001 is a deficient number, since it is larger than the sum of its proper divisors (9223745481735).

20021220011001 is a wasteful number, since it uses less digits than its factorization.

20021220011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205133.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021220011001 its reverse (10011002212002), we get a palindrome (30032222223003).

The spelling of 20021220011001 in words is "twenty trillion, twenty-one billion, two hundred twenty million, eleven thousand, one".