21771052 has 12 divisors (see below), whose sum is σ = 39328576. Its totient is φ = 10534320.

The previous prime is 21771049. The next prime is 21771053. The reversal of 21771052 is 25017712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21771053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87663 + ... + 87910.

Almost surely, 2^21771052 is an apocalyptic number.

It is an amenable number.

21771052 is a deficient number, since it is larger than the sum of its proper divisors (17557524).

21771052 is a wasteful number, since it uses less digits than its factorization.

21771052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175608 (or 175606 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 21771052 is about 4665.9459919720. The cubic root of 21771052 is about 279.2285396780.

Adding to 21771052 its reverse (25017712), we get a palindrome (46788764).

The spelling of 21771052 in words is "twenty-one million, seven hundred seventy-one thousand, fifty-two".