21231435450 has 24 divisors (see below), whose sum is σ = 52653960288. Its totient is φ = 5661716080.

The previous prime is 21231435419. The next prime is 21231435451. The reversal of 21231435450 is 5453413212.

21231435450 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (21231435451) 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, 70771302 + ... + 70771601.

It is an arithmetic number, because the mean of its divisors is an integer number (2193915012).

Almost surely, 2^21231435450 is an apocalyptic number.

21231435450 is an abundant number, since it is smaller than the sum of its proper divisors (31422524838).

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

21231435450 is a wasteful number, since it uses less digits than its factorization.

21231435450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141542918 (or 141542913 counting only the distinct ones).

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

Adding to 21231435450 its reverse (5453413212), we get a palindrome (26684848662).

The spelling of 21231435450 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-five thousand, four hundred fifty".