21014521431 has 4 divisors (see below), whose sum is σ = 28019361912. Its totient is φ = 14009680952.

The previous prime is 21014521393. The next prime is 21014521453. The reversal of 21014521431 is 13412541012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21014521431 - 2²² = 21010327127 is a prime.

It is a super-2 number, since 2×21014521431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014521631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3502420236 + ... + 3502420241.

It is an arithmetic number, because the mean of its divisors is an integer number (7004840478).

Almost surely, 2^21014521431 is an apocalyptic number.

21014521431 is a deficient number, since it is larger than the sum of its proper divisors (7004840481).

21014521431 is an equidigital number, since it uses as much as digits as its factorization.

21014521431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004840480.

The product of its (nonzero) digits is 960, while the sum is 24.

The spelling of 21014521431 in words is "twenty-one billion, fourteen million, five hundred twenty-one thousand, four hundred thirty-one".