22152421 has 2 divisors, whose sum is σ = 22152422. Its totient is φ = 22152420.

The previous prime is 22152413. The next prime is 22152437. The reversal of 22152421 is 12425122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 9084196 = 3615^2 + 3014^2 .

It is a cyclic number.

It is not a de Polignac number, because 22152421 - 2³ = 22152413 is a prime.

It is a super-2 number, since 2×22152421² = 981459512322482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22152401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11076210 + 11076211.

It is an arithmetic number, because the mean of its divisors is an integer number (11076211).

Almost surely, 2^22152421 is an apocalyptic number.

It is an amenable number.

22152421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22152421 is an equidigital number, since it uses as much as digits as its factorization.

22152421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 19.

The square root of 22152421 is about 4706.6358473967. The cubic root of 22152421 is about 280.8495498702.

Adding to 22152421 its reverse (12425122), we get a palindrome (34577543).

The spelling of 22152421 in words is "twenty-two million, one hundred fifty-two thousand, four hundred twenty-one".