21242162 has 6 divisors (see below), whose sum is σ = 31873023. Its totient is φ = 10617822.

The previous prime is 21242153. The next prime is 21242191. The reversal of 21242162 is 26124212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10621081 + 10621081 = 3259^2 + 3259^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3259.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4889 + ... + 8147.

Almost surely, 2^21242162 is an apocalyptic number.

21242162 is a deficient number, since it is larger than the sum of its proper divisors (10630861).

21242162 is an frugal number, since it uses more digits than its factorization.

21242162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6520 (or 3261 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 21242162 is about 4608.9219997739. The cubic root of 21242162 is about 276.9488538723.

Adding to 21242162 its reverse (26124212), we get a palindrome (47366374).

The spelling of 21242162 in words is "twenty-one million, two hundred forty-two thousand, one hundred sixty-two".