22212551 has 4 divisors (see below), whose sum is σ = 22222704. Its totient is φ = 22202400.

The previous prime is 22212527. The next prime is 22212569. The reversal of 22212551 is 15521222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15521222 = 2 ⋅7760611.

It is a cyclic number.

It is not a de Polignac number, because 22212551 - 2¹⁸ = 21950407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212571) 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, 290 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (5555676).

Almost surely, 2^22212551 is an apocalyptic number.

22212551 is a deficient number, since it is larger than the sum of its proper divisors (10153).

22212551 is an equidigital number, since it uses as much as digits as its factorization.

22212551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10152.

The product of its digits is 400, while the sum is 20.

The square root of 22212551 is about 4713.0193082567. The cubic root of 22212551 is about 281.1034307255.

Adding to 22212551 its reverse (15521222), we get a palindrome (37733773).

The spelling of 22212551 in words is "twenty-two million, two hundred twelve thousand, five hundred fifty-one".