21023435006244 has 480 divisors, whose sum is σ = 64323166723200. Its totient is φ = 5920646400000.

The previous prime is 21023435006237. The next prime is 21023435006269. The reversal of 21023435006244 is 44260053432012.

21023435006244 is a `hidden beast` number, since 2 + 1 + 0 + 23 + 4 + 3 + 5 + 0 + 0 + 624 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21023435006199 and 21023435006208.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 745471344 + ... + 745499544.

It is an arithmetic number, because the mean of its divisors is an integer number (134006597340).

Almost surely, 2^{21023435006244} 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 21023435006244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32161583361600).

21023435006244 is an abundant number, since it is smaller than the sum of its proper divisors (43299731716956).

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

21023435006244 is a wasteful number, since it uses less digits than its factorization.

21023435006244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28457 (or 28446 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 21023435006244 its reverse (44260053432012), we get a palindrome (65283488438256).

The spelling of 21023435006244 in words is "twenty-one trillion, twenty-three billion, four hundred thirty-five million, six thousand, two hundred forty-four".