21460819437 has 12 divisors (see below), whose sum is σ = 31044758940. Its totient is φ = 14286075648.

The previous prime is 21460819423. The next prime is 21460819441. The reversal of 21460819437 is 73491806412.

21460819437 is a `hidden beast` number, since 2 + 1 + 4 + 608 + 1 + 9 + 4 + 37 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19968233481 + 1492585956 = 141309^2 + 38634^2 .

It is not a de Polignac number, because 21460819437 - 2⁷ = 21460819309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21460819392 and 21460819401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460819487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1755012 + ... + 1767197.

It is an arithmetic number, because the mean of its divisors is an integer number (2587063245).

Almost surely, 2^21460819437 is an apocalyptic number.

It is an amenable number.

21460819437 is a deficient number, since it is larger than the sum of its proper divisors (9583939503).

21460819437 is a wasteful number, since it uses less digits than its factorization.

21460819437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522892 (or 3522889 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 21460819437 in words is "twenty-one billion, four hundred sixty million, eight hundred nineteen thousand, four hundred thirty-seven".