21455242214 has 48 divisors (see below), whose sum is σ = 39154917888. Its totient is φ = 8775054288.

The previous prime is 21455242199. The next prime is 21455242243. The reversal of 21455242214 is 41224255412.

It is a super-2 number, since 2×21455242214² (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 23 ways as a sum of consecutive naturals, for example, 987779 + ... + 1009265.

It is an arithmetic number, because the mean of its divisors is an integer number (815727456).

Almost surely, 2^21455242214 is an apocalyptic number.

21455242214 is a deficient number, since it is larger than the sum of its proper divisors (17699675674).

21455242214 is a wasteful number, since it uses less digits than its factorization.

21455242214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21969 (or 21962 counting only the distinct ones).

The product of its digits is 25600, while the sum is 32.

Adding to 21455242214 its reverse (41224255412), we get a palindrome (62679497626).

The spelling of 21455242214 in words is "twenty-one billion, four hundred fifty-five million, two hundred forty-two thousand, two hundred fourteen".