21277069 has 4 divisors (see below), whose sum is σ = 23211360. Its totient is φ = 19342780.

The previous prime is 21277063. The next prime is 21277117. The reversal of 21277069 is 96077212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21277069 - 2⁵ = 21277037 is a prime.

It is a super-2 number, since 2×21277069² = 905427330461522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967129 + ... + 967150.

It is an arithmetic number, because the mean of its divisors is an integer number (5802840).

Almost surely, 2^21277069 is an apocalyptic number.

It is an amenable number.

21277069 is a deficient number, since it is larger than the sum of its proper divisors (1934291).

21277069 is a wasteful number, since it uses less digits than its factorization.

21277069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934290.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21277069 is about 4612.7073395133. The cubic root of 21277069 is about 277.1004731378.

The spelling of 21277069 in words is "twenty-one million, two hundred seventy-seven thousand, sixty-nine".