21025405314 has 12 divisors (see below), whose sum is σ = 45555044886. Its totient is φ = 7008468432.

The previous prime is 21025405307. The next prime is 21025405319. The reversal of 21025405314 is 41350452012.

21025405314 is a `hidden beast` number, since 2 + 102 + 540 + 5 + 3 + 14 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18152981289 + 2872424025 = 134733^2 + 53595^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21025405319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 584039019 + ... + 584039054.

Almost surely, 2^21025405314 is an apocalyptic number.

21025405314 is an abundant number, since it is smaller than the sum of its proper divisors (24529639572).

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

21025405314 is a wasteful number, since it uses less digits than its factorization.

21025405314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168078081 (or 1168078078 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21025405314 its reverse (41350452012), we get a palindrome (62375857326).

The spelling of 21025405314 in words is "twenty-one billion, twenty-five million, four hundred five thousand, three hundred fourteen".