21412767 has 4 divisors (see below), whose sum is σ = 28550360. Its totient is φ = 14275176.

The previous prime is 21412739. The next prime is 21412789. The reversal of 21412767 is 76721412.

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

It is not a de Polignac number, because 21412767 - 2¹² = 21408671 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412717) 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, 3568792 + ... + 3568797.

It is an arithmetic number, because the mean of its divisors is an integer number (7137590).

Almost surely, 2^21412767 is an apocalyptic number.

21412767 is a deficient number, since it is larger than the sum of its proper divisors (7137593).

21412767 is an equidigital number, since it uses as much as digits as its factorization.

21412767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7137592.

The product of its digits is 4704, while the sum is 30.

The square root of 21412767 is about 4627.3931105969. The cubic root of 21412767 is about 277.6883098120.

The spelling of 21412767 in words is "twenty-one million, four hundred twelve thousand, seven hundred sixty-seven".