21381467562 has 384 divisors, whose sum is σ = 65441779200. Its totient is φ = 5020932096.

The previous prime is 21381467531. The next prime is 21381467593. The reversal of 21381467562 is 26576418312.

21381467562 is a `hidden beast` number, since 2 + 1 + 3 + 81 + 4 + 6 + 7 + 562 = 666.

It is an interprime number because it is at equal distance from previous prime (21381467531) and next prime (21381467593).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 30156864 + ... + 30157572.

It is an arithmetic number, because the mean of its divisors is an integer number (170421300).

Almost surely, 2^21381467562 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21381467562, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32720889600).

21381467562 is an abundant number, since it is smaller than the sum of its proper divisors (44060311638).

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

21381467562 is a wasteful number, since it uses less digits than its factorization.

21381467562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795 (or 770 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 21381467562 in words is "twenty-one billion, three hundred eighty-one million, four hundred sixty-seven thousand, five hundred sixty-two".