21202994297352 has 128 divisors (see below), whose sum is σ = 61103955824640. Its totient is φ = 6005824634880.

The previous prime is 21202994297291. The next prime is 21202994297393. The reversal of 21202994297352 is 25379249920212.

It is a junction number, because it is equal to n+sod(n) for n = 21202994297292 and 21202994297301.

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, 7946433 + ... + 10273839.

It is an arithmetic number, because the mean of its divisors is an integer number (477374654880).

Almost surely, 2^{21202994297352} 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 21202994297352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30551977912320).

21202994297352 is an abundant number, since it is smaller than the sum of its proper divisors (39900961527288).

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

21202994297352 is a wasteful number, since it uses less digits than its factorization.

21202994297352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327891 (or 2327887 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 21202994297352 in words is "twenty-one trillion, two hundred two billion, nine hundred ninety-four million, two hundred ninety-seven thousand, three hundred fifty-two".