20202201100021 has 8 divisors (see below), whose sum is σ = 20304587877464. Its totient is φ = 20099967713280.

The previous prime is 20202201099989. The next prime is 20202201100027. The reversal of 20202201100021 is 12000110220202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13998186202225 + 6204014897796 = 3741415^2 + 2490786^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20202201100021 - 2⁵ = 20202201099989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202201099974 and 20202201100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202201100027) 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, 38083596 + ... + 38610421.

It is an arithmetic number, because the mean of its divisors is an integer number (2538073484683).

Almost surely, 2^{20202201100021} is an apocalyptic number.

It is an amenable number.

20202201100021 is a deficient number, since it is larger than the sum of its proper divisors (102386777443).

20202201100021 is a wasteful number, since it uses less digits than its factorization.

20202201100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76695351.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20202201100021 its reverse (12000110220202), we get a palindrome (32202311320223).

The spelling of 20202201100021 in words is "twenty trillion, two hundred two billion, two hundred one million, one hundred thousand, twenty-one".