22220121 has 32 divisors (see below), whose sum is σ = 37813248. Its totient is φ = 11269440.

The previous prime is 22220117. The next prime is 22220131. The reversal of 22220121 is 12102222.

It is not a de Polignac number, because 22220121 - 2² = 22220117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22220097 and 22220106.

It is not an unprimeable number, because it can be changed into a prime (22220131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8815 + ... + 11051.

It is an arithmetic number, because the mean of its divisors is an integer number (1181664).

Almost surely, 2^22220121 is an apocalyptic number.

22220121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22220121 is a deficient number, since it is larger than the sum of its proper divisors (15593127).

22220121 is a wasteful number, since it uses less digits than its factorization.

22220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22220121 is about 4713.8223343694. The cubic root of 22220121 is about 281.1353602906.

Adding to 22220121 its reverse (12102222), we get a palindrome (34322343).

It can be divided in two parts, 222201 and 21, that added together give a palindrome (222222).

The spelling of 22220121 in words is "twenty-two million, two hundred twenty thousand, one hundred twenty-one".