21346445421500 has 96 divisors (see below), whose sum is σ = 47036051951616. Its totient is φ = 8462832340800.

The previous prime is 21346445421461. The next prime is 21346445421541. The reversal of 21346445421500 is 512454464312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24888809 + ... + 25732191.

It is an arithmetic number, because the mean of its divisors is an integer number (489958874496).

Almost surely, 2^{21346445421500} is an apocalyptic number.

21346445421500 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 21346445421500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23518025975808).

21346445421500 is an abundant number, since it is smaller than the sum of its proper divisors (25689606530116).

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

21346445421500 is a wasteful number, since it uses less digits than its factorization.

21346445421500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843852 (or 843840 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 41.

Adding to 21346445421500 its reverse (512454464312), we get a palindrome (21858899885812).

The spelling of 21346445421500 in words is "twenty-one trillion, three hundred forty-six billion, four hundred forty-five million, four hundred twenty-one thousand, five hundred".