21525341340 has 48 divisors (see below), whose sum is σ = 60279260832. Its totient is φ = 5739300096.

The previous prime is 21525341323. The next prime is 21525341347. The reversal of 21525341340 is 4314352512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21525341298 and 21525341307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525341347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509922 + ... + 550518.

It is an arithmetic number, because the mean of its divisors is an integer number (1255817934).

Almost surely, 2^21525341340 is an apocalyptic number.

21525341340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525341340 is an abundant number, since it is smaller than the sum of its proper divisors (38753919492).

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

21525341340 is a wasteful number, since it uses less digits than its factorization.

21525341340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49446 (or 49444 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21525341340 its reverse (4314352512), we get a palindrome (25839693852).

The spelling of 21525341340 in words is "twenty-one billion, five hundred twenty-five million, three hundred forty-one thousand, three hundred forty".