21101137 has 8 divisors (see below), whose sum is σ = 21948800. Its totient is φ = 20268144.

The previous prime is 21101123. The next prime is 21101207. The reversal of 21101137 is 73110112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101137 is a prime.

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 21101137.

It is not an unprimeable number, because it can be changed into a prime (21101737) 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, 687 + ... + 6532.

It is an arithmetic number, because the mean of its divisors is an integer number (2743600).

Almost surely, 2^21101137 is an apocalyptic number.

It is an amenable number.

21101137 is a deficient number, since it is larger than the sum of its proper divisors (847663).

21101137 is an equidigital number, since it uses as much as digits as its factorization.

21101137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7335.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 21101137 is about 4593.5973920229. The cubic root of 21101137 is about 276.3346121930.

Adding to 21101137 its reverse (73110112), we get a palindrome (94211249).

The spelling of 21101137 in words is "twenty-one million, one hundred one thousand, one hundred thirty-seven".