20421135030 has 64 divisors (see below), whose sum is σ = 50782464000. Its totient is φ = 5249381760.

The previous prime is 20421135023. The next prime is 20421135071. The reversal of 20421135030 is 3053112402.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20421134988 and 20421135006.

It is a congruent number.

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, 530371 + ... + 567569.

It is an arithmetic number, because the mean of its divisors is an integer number (793476000).

Almost surely, 2^20421135030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20421135030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25391232000).

20421135030 is an abundant number, since it is smaller than the sum of its proper divisors (30361328970).

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

20421135030 is a wasteful number, since it uses less digits than its factorization.

20421135030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37869.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20421135030 its reverse (3053112402), we get a palindrome (23474247432).

The spelling of 20421135030 in words is "twenty billion, four hundred twenty-one million, one hundred thirty-five thousand, thirty".