20021121001011 has 8 divisors (see below), whose sum is σ = 28748276309200. Its totient is φ = 12320689846752.

The previous prime is 20021121000989. The next prime is 20021121001019. The reversal of 20021121001011 is 11010012112002.

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

It is not a de Polignac number, because 20021121001011 - 2¹⁰ = 20021120999987 is a prime.

It is a super-2 number, since 2×20021121001011² (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 (20021121001019) 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, 256681038436 + ... + 256681038513.

It is an arithmetic number, because the mean of its divisors is an integer number (3593534538650).

Almost surely, 2^{20021121001011} is an apocalyptic number.

20021121001011 is a deficient number, since it is larger than the sum of its proper divisors (8727155308189).

20021121001011 is a wasteful number, since it uses less digits than its factorization.

20021121001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513362076965.

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

Adding to 20021121001011 its reverse (11010012112002), we get a palindrome (31031133113013).

The spelling of 20021121001011 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, one thousand, eleven".