20421133011640 has 16 divisors (see below), whose sum is σ = 45947549276280. Its totient is φ = 8168453204640.

The previous prime is 20421133011527. The next prime is 20421133011641. The reversal of 20421133011640 is 4611033112402.

It is a junction number, because it is equal to n+sod(n) for n = 20421133011599 and 20421133011608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421133011641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255264162606 + ... + 255264162685.

Almost surely, 2^{20421133011640} is an apocalyptic number.

20421133011640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421133011640 is an abundant number, since it is smaller than the sum of its proper divisors (25526416264640).

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

20421133011640 is a wasteful number, since it uses less digits than its factorization.

20421133011640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510528325302 (or 510528325298 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 20421133011640 in words is "twenty trillion, four hundred twenty-one billion, one hundred thirty-three million, eleven thousand, six hundred forty".