21077593 has 4 divisors (see below), whose sum is σ = 22186960. Its totient is φ = 19968228.

The previous prime is 21077561. The next prime is 21077599. The reversal of 21077593 is 39577012.

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 21077593 - 2⁵ = 21077561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21077599) 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, 554655 + ... + 554692.

It is an arithmetic number, because the mean of its divisors is an integer number (5546740).

Almost surely, 2^21077593 is an apocalyptic number.

It is an amenable number.

21077593 is a deficient number, since it is larger than the sum of its proper divisors (1109367).

21077593 is a wasteful number, since it uses less digits than its factorization.

21077593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109366.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 21077593 is about 4591.0339793994. The cubic root of 21077593 is about 276.2317987230.

The spelling of 21077593 in words is "twenty-one million, seventy-seven thousand, five hundred ninety-three".