21414887 has 4 divisors (see below), whose sum is σ = 23062200. Its totient is φ = 19767576.

The previous prime is 21414871. The next prime is 21414923. The reversal of 21414887 is 78841412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21414887 - 2⁴ = 21414871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823637 + ... + 823662.

It is an arithmetic number, because the mean of its divisors is an integer number (5765550).

Almost surely, 2^21414887 is an apocalyptic number.

21414887 is a deficient number, since it is larger than the sum of its proper divisors (1647313).

21414887 is a wasteful number, since it uses less digits than its factorization.

21414887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647312.

The product of its digits is 14336, while the sum is 35.

The square root of 21414887 is about 4627.6221755887. The cubic root of 21414887 is about 277.6974738120.

The spelling of 21414887 in words is "twenty-one million, four hundred fourteen thousand, eight hundred eighty-seven".