38213621 has 2 divisors, whose sum is σ = 38213622. Its totient is φ = 38213620.

The previous prime is 38213611. The next prime is 38213629. The reversal of 38213621 is 12631283.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 18062500 = 4489^2 + 4250^2 .

It is a cyclic number.

It is not a de Polignac number, because 38213621 - 2¹⁸ = 37951477 is a prime.

It is equal to p_2331287 and since 38213621 and 2331287 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38213629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19106810 + 19106811.

It is an arithmetic number, because the mean of its divisors is an integer number (19106811).

Almost surely, 2^38213621 is an apocalyptic number.

It is an amenable number.

38213621 is a deficient number, since it is larger than the sum of its proper divisors (1).

38213621 is an equidigital number, since it uses as much as digits as its factorization.

38213621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 38213621 is about 6181.7166709580. The cubic root of 38213621 is about 336.8263537895.

The spelling of 38213621 in words is "thirty-eight million, two hundred thirteen thousand, six hundred twenty-one".