21301245 has 32 divisors (see below), whose sum is σ = 43280640. Its totient is φ = 9737280.

The previous prime is 21301229. The next prime is 21301253. The reversal of 21301245 is 54210312.

It is not a de Polignac number, because 21301245 - 2⁴ = 21301229 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10326 + ... + 12215.

It is an arithmetic number, because the mean of its divisors is an integer number (1352520).

Almost surely, 2^21301245 is an apocalyptic number.

It is an amenable number.

21301245 is an abundant number, since it is smaller than the sum of its proper divisors (21979395).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21301245 is a wasteful number, since it uses less digits than its factorization.

21301245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22562 (or 22556 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21301245 is about 4615.3271823350. The cubic root of 21301245 is about 277.2053849144.

Adding to 21301245 its reverse (54210312), we get a palindrome (75511557).

It can be divided in two parts, 2130 and 1245, that added together give a cube (3375 = 15³).

The spelling of 21301245 in words is "twenty-one million, three hundred one thousand, two hundred forty-five".