21868419 has 8 divisors (see below), whose sum is σ = 29446992. Its totient is φ = 14434400.

The previous prime is 21868417. The next prime is 21868421. The reversal of 21868419 is 91486812.

It is an interprime number because it is at equal distance from previous prime (21868417) and next prime (21868421).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21868419 - 2¹ = 21868417 is a prime.

It is a super-2 number, since 2×21868419² = 956455499119122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21868417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35784 + ... + 36389.

It is an arithmetic number, because the mean of its divisors is an integer number (3680874).

Almost surely, 2^21868419 is an apocalyptic number.

21868419 is a deficient number, since it is larger than the sum of its proper divisors (7578573).

21868419 is a wasteful number, since it uses less digits than its factorization.

21868419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72277.

The product of its digits is 27648, while the sum is 39.

The square root of 21868419 is about 4676.3681420521. The cubic root of 21868419 is about 279.6441866429.

The spelling of 21868419 in words is "twenty-one million, eight hundred sixty-eight thousand, four hundred nineteen".