21354001 has 4 divisors (see below), whose sum is σ = 21392100. Its totient is φ = 21315904.

The previous prime is 21353993. The next prime is 21354007. The reversal of 21354001 is 10045312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1782225 + 19571776 = 1335^2 + 4424^2 .

It is a cyclic number.

It is not a de Polignac number, because 21354001 - 2³ = 21353993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21354007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18196 + ... + 19333.

It is an arithmetic number, because the mean of its divisors is an integer number (5348025).

Almost surely, 2^21354001 is an apocalyptic number.

It is an amenable number.

21354001 is a deficient number, since it is larger than the sum of its proper divisors (38099).

21354001 is an equidigital number, since it uses as much as digits as its factorization.

21354001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38098.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21354001 is about 4621.0389524435. The cubic root of 21354001 is about 277.4340443310.

Adding to 21354001 its reverse (10045312), we get a palindrome (31399313).

The spelling of 21354001 in words is "twenty-one million, three hundred fifty-four thousand, one".