21125415395 has 16 divisors (see below), whose sum is σ = 28974731520. Its totient is φ = 14484632544.

The previous prime is 21125415349. The next prime is 21125415397. The reversal of 21125415395 is 59351452112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21125415395 - 2¹² = 21125411299 is a prime.

It is a super-2 number, since 2×21125415395² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21125415397) by changing a digit.

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, 471476 + ... + 514334.

It is an arithmetic number, because the mean of its divisors is an integer number (1810920720).

Almost surely, 2^21125415395 is an apocalyptic number.

21125415395 is a deficient number, since it is larger than the sum of its proper divisors (7849316125).

21125415395 is a wasteful number, since it uses less digits than its factorization.

21125415395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56954.

The product of its digits is 54000, while the sum is 38.

The spelling of 21125415395 in words is "twenty-one billion, one hundred twenty-five million, four hundred fifteen thousand, three hundred ninety-five".