21212075404744 has 96 divisors (see below), whose sum is σ = 46916328816000. Its totient is φ = 8963701055232.

The previous prime is 21212075404739. The next prime is 21212075404777. The reversal of 21212075404744 is 44740457021212.

It is a self number, because there is not a number n which added to its sum of digits gives 21212075404744.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11677989 + ... + 13371595.

It is an arithmetic number, because the mean of its divisors is an integer number (488711758500).

Almost surely, 2^{21212075404744} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212075404744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23458164408000).

21212075404744 is an abundant number, since it is smaller than the sum of its proper divisors (25704253411256).

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

21212075404744 is a wasteful number, since it uses less digits than its factorization.

21212075404744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694075 (or 1694064 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 43.

The spelling of 21212075404744 in words is "twenty-one trillion, two hundred twelve billion, seventy-five million, four hundred four thousand, seven hundred forty-four".