21426889227 has 8 divisors (see below), whose sum is σ = 28570020864. Its totient is φ = 14284175208.

The previous prime is 21426889213. The next prime is 21426889241. The reversal of 21426889227 is 72298862412.

It is an interprime number because it is at equal distance from previous prime (21426889213) and next prime (21426889241).

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

It is not a de Polignac number, because 21426889227 - 2¹⁴ = 21426872843 is a prime.

It is a super-2 number, since 2×21426889227² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21426889227.

It is not an unprimeable number, because it can be changed into a prime (21426889327) 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, 46458 + ... + 212160.

It is an arithmetic number, because the mean of its divisors is an integer number (3571252608).

Almost surely, 2^21426889227 is an apocalyptic number.

21426889227 is a deficient number, since it is larger than the sum of its proper divisors (7143131637).

21426889227 is a wasteful number, since it uses less digits than its factorization.

21426889227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208809.

The product of its digits is 1548288, while the sum is 51.

The spelling of 21426889227 in words is "twenty-one billion, four hundred twenty-six million, eight hundred eighty-nine thousand, two hundred twenty-seven".