21530243214 has 24 divisors (see below), whose sum is σ = 46654700040. Its totient is φ = 7175849328.

The previous prime is 21530243183. The next prime is 21530243221. The reversal of 21530243214 is 41234203512.

21530243214 is a `hidden beast` number, since 215 + 3 + 0 + 2 + 432 + 14 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81772 + ... + 223040.

It is an arithmetic number, because the mean of its divisors is an integer number (1943945835).

Almost surely, 2^21530243214 is an apocalyptic number.

21530243214 is an abundant number, since it is smaller than the sum of its proper divisors (25124456826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21530243214 is a wasteful number, since it uses less digits than its factorization.

21530243214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149744 (or 149741 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21530243214 its reverse (41234203512), we get a palindrome (62764446726).

The spelling of 21530243214 in words is "twenty-one billion, five hundred thirty million, two hundred forty-three thousand, two hundred fourteen".