22121111121 has 8 divisors (see below), whose sum is σ = 29500962240. Its totient is φ = 14744333712.

The previous prime is 22121111101. The next prime is 22121111137. The reversal of 22121111121 is 12111112122.

It is a happy number.

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

It is not a de Polignac number, because 22121111121 - 2⁷ = 22121110993 is a prime.

It is a super-3 number, since 3×22121111121³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22121111121.

It is not an unprimeable number, because it can be changed into a prime (22121111101) 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, 751581 + ... + 780458.

It is an arithmetic number, because the mean of its divisors is an integer number (3687620280).

Almost surely, 2^22121111121 is an apocalyptic number.

It is an amenable number.

22121111121 is a deficient number, since it is larger than the sum of its proper divisors (7379851119).

22121111121 is a wasteful number, since it uses less digits than its factorization.

22121111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536855.

The product of its digits is 16, while the sum is 15.

Adding to 22121111121 its reverse (12111112122), we get a palindrome (34232223243).

It can be divided in two parts, 22 and 121111121, that multiplied together give a palindrome (2664444662).

The spelling of 22121111121 in words is "twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".