21430331010 has 96 divisors (see below), whose sum is σ = 60889413312. Its totient is φ = 5186240640.

The previous prime is 21430330993. The next prime is 21430331017. The reversal of 21430331010 is 1013303412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21430331017) 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, 562692 + ... + 599568.

It is an arithmetic number, because the mean of its divisors is an integer number (634264722).

Almost surely, 2^21430331010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21430331010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30444706656).

21430331010 is an abundant number, since it is smaller than the sum of its proper divisors (39459082302).

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

21430331010 is a wasteful number, since it uses less digits than its factorization.

21430331010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37488 (or 37485 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21430331010 its reverse (1013303412), we get a palindrome (22443634422).

The spelling of 21430331010 in words is "twenty-one billion, four hundred thirty million, three hundred thirty-one thousand, ten".