21856627419 has 8 divisors (see below), whose sum is σ = 31791458112. Its totient is φ = 13246440840.

The previous prime is 21856627391. The next prime is 21856627459. The reversal of 21856627419 is 91472665812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21856627419 - 2¹² = 21856623323 is a prime.

It is a super-2 number, since 2×21856627419² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21856627459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331160989 + ... + 331161054.

It is an arithmetic number, because the mean of its divisors is an integer number (3973932264).

Almost surely, 2^21856627419 is an apocalyptic number.

21856627419 is a deficient number, since it is larger than the sum of its proper divisors (9934830693).

21856627419 is a wasteful number, since it uses less digits than its factorization.

21856627419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662322057.

The product of its digits is 1451520, while the sum is 51.

The spelling of 21856627419 in words is "twenty-one billion, eight hundred fifty-six million, six hundred twenty-seven thousand, four hundred nineteen".