20000220100021 has 16 divisors (see below), whose sum is σ = 24087850207360. Its totient is φ = 16222261573440.

The previous prime is 20000220100019. The next prime is 20000220100027. The reversal of 20000220100021 is 12000102200002.

It is a cyclic number.

It is not a de Polignac number, because 20000220100021 - 2¹ = 20000220100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000220099980 and 20000220100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000220100027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85617450 + ... + 85850731.

It is an arithmetic number, because the mean of its divisors is an integer number (1505490637960).

Almost surely, 2^{20000220100021} is an apocalyptic number.

It is an amenable number.

20000220100021 is a deficient number, since it is larger than the sum of its proper divisors (4087630107339).

20000220100021 is a wasteful number, since it uses less digits than its factorization.

20000220100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171469084.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20000220100021 its reverse (12000102200002), we get a palindrome (32000322300023).

The spelling of 20000220100021 in words is "twenty trillion, two hundred twenty million, one hundred thousand, twenty-one".