21353045 has 16 divisors (see below), whose sum is σ = 29548800. Its totient is φ = 14509824.

The previous prime is 21353029. The next prime is 21353047. The reversal of 21353045 is 54035312.

It is not a de Polignac number, because 21353045 - 2⁴ = 21353029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21353045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1256 + ... + 6654.

It is an arithmetic number, because the mean of its divisors is an integer number (1846800).

Almost surely, 2^21353045 is an apocalyptic number.

It is an amenable number.

21353045 is a deficient number, since it is larger than the sum of its proper divisors (8195755).

21353045 is a wasteful number, since it uses less digits than its factorization.

21353045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5524.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21353045 is about 4620.9355113440. The cubic root of 21353045 is about 277.4299041091.

Adding to 21353045 its reverse (54035312), we get a palindrome (75388357).

The spelling of 21353045 in words is "twenty-one million, three hundred fifty-three thousand, forty-five".