21162427 has 16 divisors (see below), whose sum is σ = 25175808. Its totient is φ = 17534880.

The previous prime is 21162403. The next prime is 21162439. The reversal of 21162427 is 72426112.

It is not a de Polignac number, because 21162427 - 2¹¹ = 21160379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21162487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10978 + ... + 12760.

It is an arithmetic number, because the mean of its divisors is an integer number (1573488).

Almost surely, 2^21162427 is an apocalyptic number.

21162427 is a deficient number, since it is larger than the sum of its proper divisors (4013381).

21162427 is a wasteful number, since it uses less digits than its factorization.

21162427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890.

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

The square root of 21162427 is about 4600.2637967838. The cubic root of 21162427 is about 276.6018991631.

Adding to 21162427 its reverse (72426112), we get a palindrome (93588539).

The spelling of 21162427 in words is "twenty-one million, one hundred sixty-two thousand, four hundred twenty-seven".