21354075 has 18 divisors (see below), whose sum is σ = 38247924. Its totient is φ = 11388720.

The previous prime is 21354061. The next prime is 21354079. The reversal of 21354075 is 57045312.

It is a happy number.

It is not a de Polignac number, because 21354075 - 2⁴ = 21354059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21354079) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 47229 + ... + 47678.

Almost surely, 2^21354075 is an apocalyptic number.

21354075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21354075 is a deficient number, since it is larger than the sum of its proper divisors (16893849).

21354075 is a wasteful number, since it uses less digits than its factorization.

21354075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94923 (or 94915 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 21354075 is about 4621.0469592940. The cubic root of 21354075 is about 277.4343648032.

Adding to 21354075 its reverse (57045312), we get a palindrome (78399387).

The spelling of 21354075 in words is "twenty-one million, three hundred fifty-four thousand, seventy-five".