22121231 has 4 divisors (see below), whose sum is σ = 24132264. Its totient is φ = 20110200.

The previous prime is 22121213. The next prime is 22121293. The reversal of 22121231 is 13212122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22121231 - 2⁶ = 22121167 is a prime.

It is a super-2 number, since 2×22121231² = 978697721910722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121201) 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, 1005500 + ... + 1005521.

It is an arithmetic number, because the mean of its divisors is an integer number (6033066).

Almost surely, 2^22121231 is an apocalyptic number.

22121231 is a deficient number, since it is larger than the sum of its proper divisors (2011033).

22121231 is a wasteful number, since it uses less digits than its factorization.

22121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011032.

The product of its digits is 48, while the sum is 14.

The square root of 22121231 is about 4703.3212733131. The cubic root of 22121231 is about 280.7176784776.

Adding to 22121231 its reverse (13212122), we get a palindrome (35333353).

It can be divided in two parts, 2212 and 1231, that added together give a palindrome (3443).

The spelling of 22121231 in words is "twenty-two million, one hundred twenty-one thousand, two hundred thirty-one".