221022220201021 has 4 divisors (see below), whose sum is σ = 221082101597344. Its totient is φ = 220962338804700.

The previous prime is 221022220201009. The next prime is 221022220201049. The reversal of 221022220201021 is 120102022220122.

221022220201021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221022220201021 - 2¹⁹ = 221022219676733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221022220201021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022220201091) 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, 29940692625 + ... + 29940700006.

It is an arithmetic number, because the mean of its divisors is an integer number (55270525399336).

Almost surely, 2^{221022220201021} is an apocalyptic number.

It is an amenable number.

221022220201021 is a deficient number, since it is larger than the sum of its proper divisors (59881396323).

221022220201021 is an equidigital number, since it uses as much as digits as its factorization.

221022220201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59881396322.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221022220201021 its reverse (120102022220122), we get a palindrome (341124242421143).

The spelling of 221022220201021 in words is "two hundred twenty-one trillion, twenty-two billion, two hundred twenty million, two hundred one thousand, twenty-one".