22437421 has 2 divisors, whose sum is σ = 22437422. Its totient is φ = 22437420.

The previous prime is 22437419. The next prime is 22437427. The reversal of 22437421 is 12473422.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 6325225 = 4014^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 22437421 - 2¹ = 22437419 is a prime.

It is a super-2 number, since 2×22437421² = 1006875722262482, which contains 22 as substring.

Together with 22437419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22437427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11218710 + 11218711.

It is an arithmetic number, because the mean of its divisors is an integer number (11218711).

Almost surely, 2^22437421 is an apocalyptic number.

It is an amenable number.

22437421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22437421 is an equidigital number, since it uses as much as digits as its factorization.

22437421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 25.

The square root of 22437421 is about 4736.8154914457. The cubic root of 22437421 is about 282.0488363353.

The spelling of 22437421 in words is "twenty-two million, four hundred thirty-seven thousand, four hundred twenty-one".