20021011021021 has 32 divisors (see below), whose sum is σ = 21244041360000. Its totient is φ = 18815696686080.

The previous prime is 20021011021019. The next prime is 20021011021051. The reversal of 20021011021021 is 12012011012002.

It is a cyclic number.

It is not a de Polignac number, because 20021011021021 - 2¹ = 20021011021019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021011020992 and 20021011021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021011021051) 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, 1151351995 + ... + 1151369383.

It is an arithmetic number, because the mean of its divisors is an integer number (663876292500).

Almost surely, 2^{20021011021021} is an apocalyptic number.

It is an amenable number.

20021011021021 is a deficient number, since it is larger than the sum of its proper divisors (1223030338979).

20021011021021 is a wasteful number, since it uses less digits than its factorization.

20021011021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18637.

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

Adding to 20021011021021 its reverse (12012011012002), we get a palindrome (32033022033023).

The spelling of 20021011021021 in words is "twenty trillion, twenty-one billion, eleven million, twenty-one thousand, twenty-one".