21533077 has 8 divisors (see below), whose sum is σ = 22276800. Its totient is φ = 20799840.

The previous prime is 21533047. The next prime is 21533111. The reversal of 21533077 is 77033512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21533077 - 2⁷ = 21532949 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 (21533047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1674 + ... + 6772.

It is an arithmetic number, because the mean of its divisors is an integer number (2784600).

Almost surely, 2^21533077 is an apocalyptic number.

It is an amenable number.

21533077 is a deficient number, since it is larger than the sum of its proper divisors (743723).

21533077 is a wasteful number, since it uses less digits than its factorization.

21533077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5243.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 21533077 is about 4640.3746615979. The cubic root of 21533077 is about 278.2074129715.

Adding to 21533077 its reverse (77033512), we get a palindrome (98566589).

The spelling of 21533077 in words is "twenty-one million, five hundred thirty-three thousand, seventy-seven".