21772053 has 36 divisors (see below), whose sum is σ = 34938540. Its totient is φ = 13018368.

The previous prime is 21772033. The next prime is 21772057. The reversal of 21772053 is 35027712.

It can be written as a sum of positive squares in 2 ways, for example, as 8398404 + 13373649 = 2898^2 + 3657^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21772053 is a prime.

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 polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 80803 + ... + 81071.

It is an arithmetic number, because the mean of its divisors is an integer number (970515).

Almost surely, 2^21772053 is an apocalyptic number.

21772053 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21772053 is a deficient number, since it is larger than the sum of its proper divisors (13166487).

21772053 is a wasteful number, since it uses less digits than its factorization.

21772053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 312 counting only the distinct ones).

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

The square root of 21772053 is about 4666.0532573043. The cubic root of 21772053 is about 279.2328191142.

Adding to 21772053 its reverse (35027712), we get a palindrome (56799765).

The spelling of 21772053 in words is "twenty-one million, seven hundred seventy-two thousand, fifty-three".