21412005 has 16 divisors (see below), whose sum is σ = 35441280. Its totient is φ = 11025728.

The previous prime is 21411983. The next prime is 21412021. The reversal of 21412005 is 50021412.

It is a cyclic number.

It is not a de Polignac number, because 21412005 - 2⁶ = 21411941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24177 + ... + 25046.

It is an arithmetic number, because the mean of its divisors is an integer number (2215080).

Almost surely, 2^21412005 is an apocalyptic number.

It is an amenable number.

21412005 is a deficient number, since it is larger than the sum of its proper divisors (14029275).

21412005 is a wasteful number, since it uses less digits than its factorization.

21412005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49260.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21412005 is about 4627.3107740890. The cubic root of 21412005 is about 277.6850158114.

Adding to 21412005 its reverse (50021412), we get a palindrome (71433417).

The spelling of 21412005 in words is "twenty-one million, four hundred twelve thousand, five".