21077024 has 24 divisors (see below), whose sum is σ = 42835968. Its totient is φ = 10198080.

The previous prime is 21077011. The next prime is 21077027. The reversal of 21077024 is 42077012.

It is not an unprimeable number, because it can be changed into a prime (21077027) 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, 9632 + ... + 11615.

It is an arithmetic number, because the mean of its divisors is an integer number (1784832).

Almost surely, 2^21077024 is an apocalyptic number.

It is an amenable number.

21077024 is an abundant number, since it is smaller than the sum of its proper divisors (21758944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21077024 is a wasteful number, since it uses less digits than its factorization.

21077024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21288 (or 21280 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 21077024 is about 4590.9720103699. The cubic root of 21077024 is about 276.2293130295.

The spelling of 21077024 in words is "twenty-one million, seventy-seven thousand, twenty-four".