21875419 has 2 divisors, whose sum is σ = 21875420. Its totient is φ = 21875418.

The previous prime is 21875389. The next prime is 21875423. The reversal of 21875419 is 91457812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21875419 - 2⁵ = 21875387 is a prime.

It is a super-2 number, since 2×21875419² = 957067912851122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21870419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937709 + 10937710.

It is an arithmetic number, because the mean of its divisors is an integer number (10937710).

Almost surely, 2^21875419 is an apocalyptic number.

21875419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21875419 is an equidigital number, since it uses as much as digits as its factorization.

21875419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 21875419 is about 4677.1165262371. The cubic root of 21875419 is about 279.6740211496.

The spelling of 21875419 in words is "twenty-one million, eight hundred seventy-five thousand, four hundred nineteen".