21254030215 has 16 divisors (see below), whose sum is σ = 27863773056. Its totient is φ = 15435079200.

The previous prime is 21254030191. The next prime is 21254030251. The reversal of 21254030215 is 51203045212.

It is not a de Polignac number, because 21254030215 - 2⁷ = 21254030087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21254030215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241617 + ... + 317626.

It is an arithmetic number, because the mean of its divisors is an integer number (1741485816).

Almost surely, 2^21254030215 is an apocalyptic number.

21254030215 is a deficient number, since it is larger than the sum of its proper divisors (6609742841).

21254030215 is a wasteful number, since it uses less digits than its factorization.

21254030215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559950.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21254030215 its reverse (51203045212), we get a palindrome (72457075427).

The spelling of 21254030215 in words is "twenty-one billion, two hundred fifty-four million, thirty thousand, two hundred fifteen".