21214030240420 has 24 divisors (see below), whose sum is σ = 45753503060664. Its totient is φ = 8256271228416.

The previous prime is 21214030240387. The next prime is 21214030240421. The reversal of 21214030240420 is 2404203041212.

It can be written as a sum of positive squares in 4 ways, for example, as 2252046465124 + 18961983775296 = 1500682^2 + 4354536^2 .

It is not an unprimeable number, because it can be changed into a prime (21214030240421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14333803477 + ... + 14333804956.

It is an arithmetic number, because the mean of its divisors is an integer number (1906395960861).

Almost surely, 2^{21214030240420} is an apocalyptic number.

21214030240420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214030240420 is an abundant number, since it is smaller than the sum of its proper divisors (24539472820244).

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

21214030240420 is a wasteful number, since it uses less digits than its factorization.

21214030240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28667608479 (or 28667608477 counting only the distinct ones).

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

Adding to 21214030240420 its reverse (2404203041212), we get a palindrome (23618233281632).

The spelling of 21214030240420 in words is "twenty-one trillion, two hundred fourteen billion, thirty million, two hundred forty thousand, four hundred twenty".