21413414420 has 12 divisors (see below), whose sum is σ = 44968170324. Its totient is φ = 8565365760.

The previous prime is 21413414401. The next prime is 21413414471. The reversal of 21413414420 is 2441431412.

It can be written as a sum of positive squares in 2 ways, for example, as 2730898564 + 18682515856 = 52258^2 + 136684^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21413414420.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535335341 + ... + 535335380.

It is an arithmetic number, because the mean of its divisors is an integer number (3747347527).

Almost surely, 2^21413414420 is an apocalyptic number.

21413414420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21413414420 is an abundant number, since it is smaller than the sum of its proper divisors (23554755904).

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

21413414420 is a wasteful number, since it uses less digits than its factorization.

21413414420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070670730 (or 1070670728 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21413414420 its reverse (2441431412), we get a palindrome (23854845832).

The spelling of 21413414420 in words is "twenty-one billion, four hundred thirteen million, four hundred fourteen thousand, four hundred twenty".