20021122110021 has 8 divisors (see below), whose sum is σ = 26699954252160. Its totient is φ = 13344852353952.

The previous prime is 20021122110013. The next prime is 20021122110029. The reversal of 20021122110021 is 12001122112002.

It is an interprime number because it is at equal distance from previous prime (20021122110013) and next prime (20021122110029).

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

It is not a de Polignac number, because 20021122110021 - 2³ = 20021122110013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021122110029) 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, 640578285 + ... + 640609538.

It is an arithmetic number, because the mean of its divisors is an integer number (3337494281520).

Almost surely, 2^{20021122110021} is an apocalyptic number.

It is an amenable number.

20021122110021 is a deficient number, since it is larger than the sum of its proper divisors (6678832142139).

20021122110021 is a wasteful number, since it uses less digits than its factorization.

20021122110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281193035.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021122110021 its reverse (12001122112002), we get a palindrome (32022244222023).

The spelling of 20021122110021 in words is "twenty trillion, twenty-one billion, one hundred twenty-two million, one hundred ten thousand, twenty-one".