21240216214 has 16 divisors (see below), whose sum is σ = 37299892896. Its totient is φ = 8880926400.

The previous prime is 21240216199. The next prime is 21240216247. The reversal of 21240216214 is 41261204212.

It is a super-2 number, since 2×21240216214² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18501357 + ... + 18502504.

It is an arithmetic number, because the mean of its divisors is an integer number (2331243306).

Almost surely, 2^21240216214 is an apocalyptic number.

21240216214 is a deficient number, since it is larger than the sum of its proper divisors (16059676682).

21240216214 is a wasteful number, since it uses less digits than its factorization.

21240216214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37003911.

The product of its (nonzero) digits is 1536, while the sum is 25.

The spelling of 21240216214 in words is "twenty-one billion, two hundred forty million, two hundred sixteen thousand, two hundred fourteen".