21225534350020 has 192 divisors, whose sum is σ = 60027926740992. Its totient is φ = 6088395456000.

The previous prime is 21225534350011. The next prime is 21225534350047. The reversal of 21225534350020 is 2005343552212.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5025085 + ... + 8228155.

It is an arithmetic number, because the mean of its divisors is an integer number (312645451776).

Almost surely, 2^{21225534350020} is an apocalyptic number.

21225534350020 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 21225534350020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30013963370496).

21225534350020 is an abundant number, since it is smaller than the sum of its proper divisors (38802392390972).

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

21225534350020 is a wasteful number, since it uses less digits than its factorization.

21225534350020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203442 (or 3203440 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

The spelling of 21225534350020 in words is "twenty-one trillion, two hundred twenty-five billion, five hundred thirty-four million, three hundred fifty thousand, twenty".