21214089 has 32 divisors (see below), whose sum is σ = 35638400. Its totient is φ = 12363840.

The previous prime is 21214087. The next prime is 21214111. The reversal of 21214089 is 98041212.

It is not a de Polignac number, because 21214089 - 2¹ = 21214087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5079 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (1113700).

Almost surely, 2^21214089 is an apocalyptic number.

It is an amenable number.

21214089 is a deficient number, since it is larger than the sum of its proper divisors (14424311).

21214089 is a wasteful number, since it uses less digits than its factorization.

21214089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222 (or 3216 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21214089 is about 4605.8754868103. The cubic root of 21214089 is about 276.8267976731.

The spelling of 21214089 in words is "twenty-one million, two hundred fourteen thousand, eighty-nine".