21140252245 has 16 divisors (see below), whose sum is σ = 30518259840. Its totient is φ = 13733216064.

The previous prime is 21140252227. The next prime is 21140252261. The reversal of 21140252245 is 54225204112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21140252245 - 2¹³ = 21140244053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15894262 + ... + 15895591.

It is an arithmetic number, because the mean of its divisors is an integer number (1907391240).

Almost surely, 2^21140252245 is an apocalyptic number.

It is an amenable number.

21140252245 is a deficient number, since it is larger than the sum of its proper divisors (9378007595).

21140252245 is a wasteful number, since it uses less digits than its factorization.

21140252245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31789884.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 21140252245 its reverse (54225204112), we get a palindrome (75365456357).

The spelling of 21140252245 in words is "twenty-one billion, one hundred forty million, two hundred fifty-two thousand, two hundred forty-five".