21712221219 has 16 divisors (see below), whose sum is σ = 31192324352. Its totient is φ = 13354594848.

The previous prime is 21712221217. The next prime is 21712221221. The reversal of 21712221219 is 91212221712.

It is an interprime number because it is at equal distance from previous prime (21712221217) and next prime (21712221221).

It is not a de Polignac number, because 21712221219 - 2¹ = 21712221217 is a prime.

It is a super-2 number, since 2×21712221219² (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 (21712221217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62599 + ... + 217584.

It is an arithmetic number, because the mean of its divisors is an integer number (1949520272).

Almost surely, 2^21712221219 is an apocalyptic number.

21712221219 is a deficient number, since it is larger than the sum of its proper divisors (9480103133).

21712221219 is a wasteful number, since it uses less digits than its factorization.

21712221219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282186.

The product of its digits is 2016, while the sum is 30.

The spelling of 21712221219 in words is "twenty-one billion, seven hundred twelve million, two hundred twenty-one thousand, two hundred nineteen".