21412124420 has 12 divisors (see below), whose sum is σ = 44965461324. Its totient is φ = 8564849760.

The previous prime is 21412124399. The next prime is 21412124441. The reversal of 21412124420 is 2442121412.

It is an interprime number because it is at equal distance from previous prime (21412124399) and next prime (21412124441).

It can be written as a sum of positive squares in 2 ways, for example, as 15651010816 + 5761113604 = 125104^2 + 75902^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535303091 + ... + 535303130.

It is an arithmetic number, because the mean of its divisors is an integer number (3747121777).

Almost surely, 2^21412124420 is an apocalyptic number.

21412124420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21412124420 is an abundant number, since it is smaller than the sum of its proper divisors (23553336904).

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

21412124420 is a wasteful number, since it uses less digits than its factorization.

21412124420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070606230 (or 1070606228 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21412124420 its reverse (2442121412), we get a palindrome (23854245832).

The spelling of 21412124420 in words is "twenty-one billion, four hundred twelve million, one hundred twenty-four thousand, four hundred twenty".