21762053 has 2 divisors, whose sum is σ = 21762054. Its totient is φ = 21762052.

The previous prime is 21762007. The next prime is 21762061. The reversal of 21762053 is 35026712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17833729 + 3928324 = 4223^2 + 1982^2 .

It is a cyclic number.

It is not a de Polignac number, because 21762053 - 2⁸ = 21761797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21762073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10881026 + 10881027.

It is an arithmetic number, because the mean of its divisors is an integer number (10881027).

Almost surely, 2^21762053 is an apocalyptic number.

It is an amenable number.

21762053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21762053 is an equidigital number, since it uses as much as digits as its factorization.

21762053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21762053 is about 4664.9815648082. The cubic root of 21762053 is about 279.1900616121.

Adding to 21762053 its reverse (35026712), we get a palindrome (56788765).

The spelling of 21762053 in words is "twenty-one million, seven hundred sixty-two thousand, fifty-three".