21625506919 has 4 divisors (see below), whose sum is σ = 21642130440. Its totient is φ = 21608883400.

The previous prime is 21625506901. The next prime is 21625506937. The reversal of 21625506919 is 91960552612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21625506901) and next prime (21625506937).

It is a cyclic number.

It is not a de Polignac number, because 21625506919 - 2¹¹ = 21625504871 is a prime.

It is a super-2 number, since 2×21625506919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625503919) 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 3 ways as a sum of consecutive naturals, for example, 8309809 + ... + 8312410.

It is an arithmetic number, because the mean of its divisors is an integer number (5410532610).

Almost surely, 2^21625506919 is an apocalyptic number.

21625506919 is a deficient number, since it is larger than the sum of its proper divisors (16623521).

21625506919 is a wasteful number, since it uses less digits than its factorization.

21625506919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16623520.

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 21625506919 in words is "twenty-one billion, six hundred twenty-five million, five hundred six thousand, nine hundred nineteen".