21532077 has 24 divisors (see below), whose sum is σ = 35830080. Its totient is φ = 12205440.

The previous prime is 21532067. The next prime is 21532087. The reversal of 21532077 is 77023512.

It is an interprime number because it is at equal distance from previous prime (21532067) and next prime (21532087).

It is not a de Polignac number, because 21532077 - 2⁸ = 21531821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21532077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532067) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6949 + ... + 9557.

It is an arithmetic number, because the mean of its divisors is an integer number (1492920).

Almost surely, 2^21532077 is an apocalyptic number.

It is an amenable number.

21532077 is a deficient number, since it is larger than the sum of its proper divisors (14298003).

21532077 is a wasteful number, since it uses less digits than its factorization.

21532077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753 (or 2750 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21532077 is about 4640.2669104266. The cubic root of 21532077 is about 278.2031062373.

Adding to 21532077 its reverse (77023512), we get a palindrome (98555589).

The spelling of 21532077 in words is "twenty-one million, five hundred thirty-two thousand, seventy-seven".