21245311746460 has 96 divisors (see below), whose sum is σ = 47681202381120. Its totient is φ = 7923487592448.

The previous prime is 21245311746433. The next prime is 21245311746469. The reversal of 21245311746460 is 6464711354212.

It is a self number, because there is not a number n which added to its sum of digits gives 21245311746460.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245311746469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228724947 + ... + 228817813.

It is an arithmetic number, because the mean of its divisors is an integer number (496679191470).

Almost surely, 2^{21245311746460} is an apocalyptic number.

21245311746460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21245311746460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23840601190560).

21245311746460 is an abundant number, since it is smaller than the sum of its proper divisors (26435890634660).

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

21245311746460 is a wasteful number, since it uses less digits than its factorization.

21245311746460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99175 (or 99173 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 21245311746460 in words is "twenty-one trillion, two hundred forty-five billion, three hundred eleven million, seven hundred forty-six thousand, four hundred sixty".