21022202 has 4 divisors (see below), whose sum is σ = 31533306. Its totient is φ = 10511100.

The previous prime is 21022193. The next prime is 21022213. The reversal of 21022202 is 20222012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 942841 = 4481^2 + 971^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255549 + ... + 5255552.

Almost surely, 2^21022202 is an apocalyptic number.

21022202 is a deficient number, since it is larger than the sum of its proper divisors (10511104).

21022202 is a wasteful number, since it uses less digits than its factorization.

21022202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511103.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 21022202 is about 4584.9974918205. The cubic root of 21022202 is about 275.9896113852.

Adding to 21022202 its reverse (20222012), we get a palindrome (41244214).

The spelling of 21022202 in words is "twenty-one million, twenty-two thousand, two hundred two".