21412069 has 24 divisors (see below), whose sum is σ = 26584800. Its totient is φ = 17146080.

The previous prime is 21412049. The next prime is 21412093. The reversal of 21412069 is 96021412.

It is not a de Polignac number, because 21412069 - 2⁷ = 21411941 is a prime.

It is a super-2 number, since 2×21412069² = 916953397721522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101374 + ... + 101584.

It is an arithmetic number, because the mean of its divisors is an integer number (1107700).

Almost surely, 2^21412069 is an apocalyptic number.

It is an amenable number.

21412069 is a deficient number, since it is larger than the sum of its proper divisors (5172731).

21412069 is a wasteful number, since it uses less digits than its factorization.

21412069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21412069 is about 4627.3176895476. The cubic root of 21412069 is about 277.6852924759.

The spelling of 21412069 in words is "twenty-one million, four hundred twelve thousand, sixty-nine".