20200221112021 has 4 divisors (see below), whose sum is σ = 20221779513292. Its totient is φ = 20178662710752.

The previous prime is 20200221112007. The next prime is 20200221112037. The reversal of 20200221112021 is 12021112200202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 408052664100 + 19792168447921 = 638790^2 + 4448839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20200221112021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20200221111986 and 20200221112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20200221112061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10779199230 + ... + 10779201103.

It is an arithmetic number, because the mean of its divisors is an integer number (5055444878323).

Almost surely, 2^{20200221112021} is an apocalyptic number.

It is an amenable number.

20200221112021 is a deficient number, since it is larger than the sum of its proper divisors (21558401271).

20200221112021 is an equidigital number, since it uses as much as digits as its factorization.

20200221112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21558401270.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20200221112021 its reverse (12021112200202), we get a palindrome (32221333312223).

The spelling of 20200221112021 in words is "twenty trillion, two hundred billion, two hundred twenty-one million, one hundred twelve thousand, twenty-one".