21250614409 has 4 divisors (see below), whose sum is σ = 21250969216. Its totient is φ = 21250259604.

The previous prime is 21250614389. The next prime is 21250614433. The reversal of 21250614409 is 90441605212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21250614409 - 2¹³ = 21250606217 is a prime.

It is a super-2 number, since 2×21250614409² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250614479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62949 + ... + 215554.

It is an arithmetic number, because the mean of its divisors is an integer number (5312742304).

Almost surely, 2^21250614409 is an apocalyptic number.

It is an amenable number.

21250614409 is a deficient number, since it is larger than the sum of its proper divisors (354807).

21250614409 is an equidigital number, since it uses as much as digits as its factorization.

21250614409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354806.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 21250614409 in words is "twenty-one billion, two hundred fifty million, six hundred fourteen thousand, four hundred nine".