21202055 has 12 divisors (see below), whose sum is σ = 29596680. Its totient is φ = 14538384.

The previous prime is 21202039. The next prime is 21202079. The reversal of 21202055 is 55020212.

It is not a de Polignac number, because 21202055 - 2⁴ = 21202039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43025 + ... + 43514.

It is an arithmetic number, because the mean of its divisors is an integer number (2466390).

Almost surely, 2^21202055 is an apocalyptic number.

21202055 is a deficient number, since it is larger than the sum of its proper divisors (8394625).

21202055 is an equidigital number, since it uses as much as digits as its factorization.

21202055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86558 (or 86551 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 21202055 is about 4604.5689266206. The cubic root of 21202055 is about 276.7744430988.

Adding to 21202055 its reverse (55020212), we get a palindrome (76222267).

The spelling of 21202055 in words is "twenty-one million, two hundred two thousand, fifty-five".