21314137 has 8 divisors (see below), whose sum is σ = 23514120. Its totient is φ = 19194240.

The previous prime is 21314087. The next prime is 21314149. The reversal of 21314137 is 73141312.

It can be written as a sum of positive squares in 4 ways, for example, as 1565001 + 19749136 = 1251^2 + 4444^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21314137 - 2¹⁵ = 21281369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21314177) 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, 19462 + ... + 20527.

It is an arithmetic number, because the mean of its divisors is an integer number (2939265).

Almost surely, 2^21314137 is an apocalyptic number.

It is an amenable number.

21314137 is a deficient number, since it is larger than the sum of its proper divisors (2199983).

21314137 is a wasteful number, since it uses less digits than its factorization.

21314137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40043.

The product of its digits is 504, while the sum is 22.

The square root of 21314137 is about 4616.7236217907. The cubic root of 21314137 is about 277.2612973129.

Adding to 21314137 its reverse (73141312), we get a palindrome (94455449).

The spelling of 21314137 in words is "twenty-one million, three hundred fourteen thousand, one hundred thirty-seven".