20010101202221 has 8 divisors (see below), whose sum is σ = 21549378994080. Its totient is φ = 18470829015792.

The previous prime is 20010101202167. The next prime is 20010101202241. The reversal of 20010101202221 is 12220210101002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010101202221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010101202196 and 20010101202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010101202241) 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, 8720666 + ... + 10773588.

It is an arithmetic number, because the mean of its divisors is an integer number (2693672374260).

Almost surely, 2^{20010101202221} is an apocalyptic number.

It is an amenable number.

20010101202221 is a deficient number, since it is larger than the sum of its proper divisors (1539277791859).

20010101202221 is a wasteful number, since it uses less digits than its factorization.

20010101202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802715.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20010101202221 its reverse (12220210101002), we get a palindrome (32230311303223).

The spelling of 20010101202221 in words is "twenty trillion, ten billion, one hundred one million, two hundred two thousand, two hundred twenty-one".