21602212 has 6 divisors (see below), whose sum is σ = 37803878. Its totient is φ = 10801104.

The previous prime is 21602197. The next prime is 21602237. The reversal of 21602212 is 21220612.

It can be written as a sum of positive squares in only one way, i.e., 14333796 + 7268416 = 3786^2 + 2696^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2700273 + ... + 2700280.

Almost surely, 2^21602212 is an apocalyptic number.

It is an amenable number.

21602212 is a deficient number, since it is larger than the sum of its proper divisors (16201666).

21602212 is a wasteful number, since it uses less digits than its factorization.

21602212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5400557 (or 5400555 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21602212 is about 4647.8179826667. The cubic root of 21602212 is about 278.5048363538.

Adding to 21602212 its reverse (21220612), we get a palindrome (42822824).

The spelling of 21602212 in words is "twenty-one million, six hundred two thousand, two hundred twelve".