21353007 has 8 divisors (see below), whose sum is σ = 30660784. Its totient is φ = 13140288.

The previous prime is 21352999. The next prime is 21353009. The reversal of 21353007 is 70035312.

It is a happy number.

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

It is not a de Polignac number, because 21353007 - 2³ = 21352999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353009) 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 7 ways as a sum of consecutive naturals, for example, 273718 + ... + 273795.

It is an arithmetic number, because the mean of its divisors is an integer number (3832598).

Almost surely, 2^21353007 is an apocalyptic number.

21353007 is a deficient number, since it is larger than the sum of its proper divisors (9307777).

21353007 is a wasteful number, since it uses less digits than its factorization.

21353007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547529.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 21353007 is about 4620.9313996206. The cubic root of 21353007 is about 277.4297395371.

Adding to 21353007 its reverse (70035312), we get a palindrome (91388319).

It can be divided in two parts, 21 and 353007, that multiplied together give a palindrome (7413147).

The spelling of 21353007 in words is "twenty-one million, three hundred fifty-three thousand, seven".