221222210222021 has 4 divisors (see below), whose sum is σ = 222380441689344. Its totient is φ = 220063978754700.

The previous prime is 221222210221981. The next prime is 221222210222051. The reversal of 221222210222021 is 120222012222122.

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 221222210222021 - 2⁴⁶ = 150853466044357 is a prime.

It is a super-2 number, since 2×221222210222021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222210222051) 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, 579115733375 + ... + 579115733756.

It is an arithmetic number, because the mean of its divisors is an integer number (55595110422336).

Almost surely, 2^{221222210222021} is an apocalyptic number.

It is an amenable number.

221222210222021 is a deficient number, since it is larger than the sum of its proper divisors (1158231467323).

221222210222021 is a wasteful number, since it uses less digits than its factorization.

221222210222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158231467322.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221222210222021 its reverse (120222012222122), we get a palindrome (341444222444143).

The spelling of 221222210222021 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred ten million, two hundred twenty-two thousand, twenty-one".