21531112014 has 8 divisors (see below), whose sum is σ = 43062224040. Its totient is φ = 7177037336.

The previous prime is 21531112007. The next prime is 21531112021. The reversal of 21531112014 is 41021113512.

It is an interprime number because it is at equal distance from previous prime (21531112007) and next prime (21531112021).

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

21531112014 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794259329 + ... + 1794259340.

It is an arithmetic number, because the mean of its divisors is an integer number (5382778005).

Almost surely, 2^21531112014 is an apocalyptic number.

21531112014 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21531112014 is a wasteful number, since it uses less digits than its factorization.

21531112014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588518674.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 21531112014 its reverse (41021113512), we get a palindrome (62552225526).

The spelling of 21531112014 in words is "twenty-one billion, five hundred thirty-one million, one hundred twelve thousand, fourteen".