21246344130 has 128 divisors (see below), whose sum is σ = 56535791616. Its totient is φ = 5066841600.

The previous prime is 21246344111. The next prime is 21246344137. The reversal of 21246344130 is 3144364212.

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 (21246344137) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11730925 + ... + 11732735.

It is an arithmetic number, because the mean of its divisors is an integer number (441685872).

Almost surely, 2^21246344130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21246344130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28267895808).

21246344130 is an abundant number, since it is smaller than the sum of its proper divisors (35289447486).

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

21246344130 is a wasteful number, since it uses less digits than its factorization.

21246344130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392.

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 21246344130 in words is "twenty-one billion, two hundred forty-six million, three hundred forty-four thousand, one hundred thirty".