20421100333340 has 144 divisors (see below), whose sum is σ = 50116285578240. Its totient is φ = 6969188903040.

The previous prime is 20421100333321. The next prime is 20421100333357. The reversal of 20421100333340 is 4333300112402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1726061225 + ... + 1726073055.

It is an arithmetic number, because the mean of its divisors is an integer number (348029760960).

Almost surely, 2^{20421100333340} is an apocalyptic number.

20421100333340 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 20421100333340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25058142789120).

20421100333340 is an abundant number, since it is smaller than the sum of its proper divisors (29695185244900).

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

20421100333340 is a wasteful number, since it uses less digits than its factorization.

20421100333340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19840 (or 19831 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 20421100333340 its reverse (4333300112402), we get a palindrome (24754400445742).

The spelling of 20421100333340 in words is "twenty trillion, four hundred twenty-one billion, one hundred million, three hundred thirty-three thousand, three hundred forty".