21023242121430 has 320 divisors, whose sum is σ = 57370430227968. Its totient is φ = 5523415349760.

The previous prime is 21023242121423. The next prime is 21023242121443. The reversal of 21023242121430 is 3412124232012.

21023242121430 is a `hidden beast` number, since 2 + 1 + 0 + 23 + 2 + 421 + 214 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21023242121394 and 21023242121403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 18720606849 + ... + 18720607971.

Almost surely, 2^{21023242121430} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023242121430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28685215113984).

21023242121430 is an abundant number, since it is smaller than the sum of its proper divisors (36347188106538).

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

21023242121430 is a wasteful number, since it uses less digits than its factorization.

21023242121430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193 (or 2184 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21023242121430 its reverse (3412124232012), we get a palindrome (24435366353442).

The spelling of 21023242121430 in words is "twenty-one trillion, twenty-three billion, two hundred forty-two million, one hundred twenty-one thousand, four hundred thirty".