21772052 has 12 divisors (see below), whose sum is σ = 38670240. Its totient is φ = 10723416.

The previous prime is 21772033. The next prime is 21772057. The reversal of 21772052 is 25027712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772057) 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, 40352 + ... + 40887.

It is an arithmetic number, because the mean of its divisors is an integer number (3222520).

Almost surely, 2^21772052 is an apocalyptic number.

It is an amenable number.

21772052 is a deficient number, since it is larger than the sum of its proper divisors (16898188).

21772052 is a wasteful number, since it uses less digits than its factorization.

21772052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81310 (or 81308 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21772052 is about 4666.0531501473. The cubic root of 21772052 is about 279.2328148391.

Adding to 21772052 its reverse (25027712), we get a palindrome (46799764).

The spelling of 21772052 in words is "twenty-one million, seven hundred seventy-two thousand, fifty-two".