21874419 has 24 divisors (see below), whose sum is σ = 36471552. Its totient is φ = 12374640.

The previous prime is 21874409. The next prime is 21874421. The reversal of 21874419 is 91447812.

It is not a de Polignac number, because 21874419 - 2⁸ = 21874163 is a prime.

It is a super-2 number, since 2×21874419² = 956980413175122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21874409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4804 + ... + 8174.

It is an arithmetic number, because the mean of its divisors is an integer number (1519648).

Almost surely, 2^21874419 is an apocalyptic number.

21874419 is a deficient number, since it is larger than the sum of its proper divisors (14597133).

21874419 is a wasteful number, since it uses less digits than its factorization.

21874419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487 (or 3484 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 21874419 is about 4677.0096215424. The cubic root of 21874419 is about 279.6697594669.

It can be divided in two parts, 2187441 and 9, that multiplied together give a square (19686969 = 4437²).

The spelling of 21874419 in words is "twenty-one million, eight hundred seventy-four thousand, four hundred nineteen".