40222421 has 2 divisors, whose sum is σ = 40222422. Its totient is φ = 40222420.

The previous prime is 40222397. The next prime is 40222433. The reversal of 40222421 is 12422204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39250225 + 972196 = 6265^2 + 986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40222421 is a prime.

It is a super-2 number, since 2×40222421² = 3235686302202482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40222421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40222471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20111210 + 20111211.

It is an arithmetic number, because the mean of its divisors is an integer number (20111211).

Almost surely, 2^40222421 is an apocalyptic number.

It is an amenable number.

40222421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40222421 is an equidigital number, since it uses as much as digits as its factorization.

40222421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 40222421 is about 6342.1148680862. The cubic root of 40222421 is about 342.6279089628.

Adding to 40222421 its reverse (12422204), we get a palindrome (52644625).

The spelling of 40222421 in words is "forty million, two hundred twenty-two thousand, four hundred twenty-one".