21162274 has 16 divisors (see below), whose sum is σ = 37449216. Its totient is φ = 8776800.

The previous prime is 21162259. The next prime is 21162287. The reversal of 21162274 is 47226112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23947 + ... + 24814.

It is an arithmetic number, because the mean of its divisors is an integer number (2340576).

Almost surely, 2^21162274 is an apocalyptic number.

21162274 is a deficient number, since it is larger than the sum of its proper divisors (16286942).

21162274 is a wasteful number, since it uses less digits than its factorization.

21162274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48801.

The product of its digits is 1344, while the sum is 25.

The square root of 21162274 is about 4600.2471672726. The cubic root of 21162274 is about 276.6012325699.

Adding to 21162274 its reverse (47226112), we get a palindrome (68388386).

The spelling of 21162274 in words is "twenty-one million, one hundred sixty-two thousand, two hundred seventy-four".