21534400230 has 32 divisors (see below), whose sum is σ = 59065784064. Its totient is φ = 4922148576.

The previous prime is 21534400219. The next prime is 21534400231. The reversal of 21534400230 is 3200443512.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21534400230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534400231) 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, 51272172 + ... + 51272591.

It is an arithmetic number, because the mean of its divisors is an integer number (1845805752).

Almost surely, 2^21534400230 is an apocalyptic number.

21534400230 is an abundant number, since it is smaller than the sum of its proper divisors (37531383834).

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

21534400230 is a wasteful number, since it uses less digits than its factorization.

21534400230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102544780.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21534400230 its reverse (3200443512), we get a palindrome (24734843742).

The spelling of 21534400230 in words is "twenty-one billion, five hundred thirty-four million, four hundred thousand, two hundred thirty".