21362157 has 8 divisors (see below), whose sum is σ = 31647680. Its totient is φ = 14241420.

The previous prime is 21362119. The next prime is 21362161. The reversal of 21362157 is 75126312.

It is a happy number.

It is not a de Polignac number, because 21362157 - 2¹⁰ = 21361133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 791191 = 21362157 / (2 + 1 + 3 + 6 + 2 + 1 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21362157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395569 + ... + 395622.

It is an arithmetic number, because the mean of its divisors is an integer number (3955960).

Almost surely, 2^21362157 is an apocalyptic number.

21362157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21362157 is a deficient number, since it is larger than the sum of its proper divisors (10285523).

21362157 is an equidigital number, since it uses as much as digits as its factorization.

21362157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791200 (or 791194 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21362157 is about 4621.9213537229. The cubic root of 21362157 is about 277.4693611169.

Adding to 21362157 its reverse (75126312), we get a palindrome (96488469).

The spelling of 21362157 in words is "twenty-one million, three hundred sixty-two thousand, one hundred fifty-seven".