21421450524 has 24 divisors (see below), whose sum is σ = 51145790080. Its totient is φ = 6974425584.

The previous prime is 21421450517. The next prime is 21421450537. The reversal of 21421450524 is 42505412412.

It is a junction number, because it is equal to n+sod(n) for n = 21421450491 and 21421450500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20756704 + ... + 20757735.

Almost surely, 2^21421450524 is an apocalyptic number.

It is an amenable number.

21421450524 is an abundant number, since it is smaller than the sum of its proper divisors (29724339556).

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

21421450524 is a wasteful number, since it uses less digits than its factorization.

21421450524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41514489 (or 41514487 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21421450524 its reverse (42505412412), we get a palindrome (63926862936).

The spelling of 21421450524 in words is "twenty-one billion, four hundred twenty-one million, four hundred fifty thousand, five hundred twenty-four".