21465077 has 4 divisors (see below), whose sum is σ = 21479040. Its totient is φ = 21451116.

The previous prime is 21465071. The next prime is 21465121. The reversal of 21465077 is 77056412.

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 21465077 - 2⁴ = 21465061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21465071) 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, 4343 + ... + 7860.

It is an arithmetic number, because the mean of its divisors is an integer number (5369760).

Almost surely, 2^21465077 is an apocalyptic number.

It is an amenable number.

21465077 is a deficient number, since it is larger than the sum of its proper divisors (13963).

21465077 is a wasteful number, since it uses less digits than its factorization.

21465077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13962.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21465077 is about 4633.0418733269. The cubic root of 21465077 is about 277.9142507647.

The spelling of 21465077 in words is "twenty-one million, four hundred sixty-five thousand, seventy-seven".