21024134002420 has 24 divisors (see below), whose sum is σ = 44150923845000. Its totient is φ = 8409607421952.

The previous prime is 21024134002409. The next prime is 21024134002439. The reversal of 21024134002420 is 2420043142012.

It can be written as a sum of positive squares in 4 ways, for example, as 86499515664 + 20937634486756 = 294108^2 + 4575766^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 972916 + ... + 6557044.

It is an arithmetic number, because the mean of its divisors is an integer number (1839621826875).

Almost surely, 2^{21024134002420} is an apocalyptic number.

21024134002420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024134002420 is an abundant number, since it is smaller than the sum of its proper divisors (23126789842580).

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

21024134002420 is a wasteful number, since it uses less digits than its factorization.

21024134002420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5772387 (or 5772385 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21024134002420 its reverse (2420043142012), we get a palindrome (23444177144432).

The spelling of 21024134002420 in words is "twenty-one trillion, twenty-four billion, one hundred thirty-four million, two thousand, four hundred twenty".