21345230250 has 96 divisors (see below), whose sum is σ = 58064138496. Its totient is φ = 5657877600.

The previous prime is 21345230239. The next prime is 21345230251. The reversal of 21345230250 is 5203254312.

It is a happy number.

21345230250 is a `hidden beast` number, since 2 + 134 + 523 + 0 + 2 + 5 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (21345230251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 347347 + ... + 404153.

It is an arithmetic number, because the mean of its divisors is an integer number (604834776).

Almost surely, 2^21345230250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21345230250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29032069248).

21345230250 is an abundant number, since it is smaller than the sum of its proper divisors (36718908246).

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

21345230250 is a wasteful number, since it uses less digits than its factorization.

21345230250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56997 (or 56984 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21345230250 its reverse (5203254312), we get a palindrome (26548484562).

The spelling of 21345230250 in words is "twenty-one billion, three hundred forty-five million, two hundred thirty thousand, two hundred fifty".