201624421 has 2 divisors, whose sum is σ = 201624422. Its totient is φ = 201624420.

The previous prime is 201624413. The next prime is 201624439. The reversal of 201624421 is 124426102.

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., 151413025 + 50211396 = 12305^2 + 7086^2 .

It is a cyclic number.

It is not a de Polignac number, because 201624421 - 2³ = 201624413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201624392 and 201624401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201624121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100812210 + 100812211.

It is an arithmetic number, because the mean of its divisors is an integer number (100812211).

Almost surely, 2^201624421 is an apocalyptic number.

It is an amenable number.

201624421 is a deficient number, since it is larger than the sum of its proper divisors (1).

201624421 is an equidigital number, since it uses as much as digits as its factorization.

201624421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 201624421 is about 14199.4514330660. The cubic root of 201624421 is about 586.3825589682.

The spelling of 201624421 in words is "two hundred one million, six hundred twenty-four thousand, four hundred twenty-one".