21101361 has 4 divisors (see below), whose sum is σ = 28135152. Its totient is φ = 14067572.

The previous prime is 21101341. The next prime is 21101371. The reversal of 21101361 is 16310112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101361 - 2¹³ = 21093169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21101361.

It is not an unprimeable number, because it can be changed into a prime (21101341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3516891 + ... + 3516896.

It is an arithmetic number, because the mean of its divisors is an integer number (7033788).

Almost surely, 2^21101361 is an apocalyptic number.

It is an amenable number.

21101361 is a deficient number, since it is larger than the sum of its proper divisors (7033791).

21101361 is an equidigital number, since it uses as much as digits as its factorization.

21101361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033790.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 21101361 is about 4593.6217737206. The cubic root of 21101361 is about 276.3355900034.

Adding to 21101361 its reverse (16310112), we get a palindrome (37411473).

The spelling of 21101361 in words is "twenty-one million, one hundred one thousand, three hundred sixty-one".