21232077 has 4 divisors (see below), whose sum is σ = 28309440. Its totient is φ = 14154716.

The previous prime is 21232073. The next prime is 21232091. The reversal of 21232077 is 77023212.

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 21232077 - 2² = 21232073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232073) 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, 3538677 + ... + 3538682.

It is an arithmetic number, because the mean of its divisors is an integer number (7077360).

Almost surely, 2^21232077 is an apocalyptic number.

It is an amenable number.

21232077 is a deficient number, since it is larger than the sum of its proper divisors (7077363).

21232077 is an equidigital number, since it uses as much as digits as its factorization.

21232077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077362.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21232077 is about 4607.8277962615. The cubic root of 21232077 is about 276.9050185458.

Adding to 21232077 its reverse (77023212), we get a palindrome (98255289).

The spelling of 21232077 in words is "twenty-one million, two hundred thirty-two thousand, seventy-seven".