22102021221 has 8 divisors (see below), whose sum is σ = 33679270464. Its totient is φ = 12629726400.

The previous prime is 22102021217. The next prime is 22102021223. The reversal of 22102021221 is 12212020122.

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

It is not a de Polignac number, because 22102021221 - 2² = 22102021217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22102021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102021223) 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, 526238580 + ... + 526238621.

It is an arithmetic number, because the mean of its divisors is an integer number (4209908808).

Almost surely, 2^22102021221 is an apocalyptic number.

22102021221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22102021221 is a deficient number, since it is larger than the sum of its proper divisors (11577249243).

22102021221 is a wasteful number, since it uses less digits than its factorization.

22102021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052477211.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22102021221 its reverse (12212020122), we get a palindrome (34314041343).

The spelling of 22102021221 in words is "twenty-two billion, one hundred two million, twenty-one thousand, two hundred twenty-one".