21421411420 has 48 divisors (see below), whose sum is σ = 45717654528. Its totient is φ = 8429529920.

The previous prime is 21421411381. The next prime is 21421411423. The reversal of 21421411420 is 2411412412.

It is a junction number, because it is equal to n+sod(n) for n = 21421411391 and 21421411400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421411423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646989 + ... + 679291.

It is an arithmetic number, because the mean of its divisors is an integer number (952451136).

Almost surely, 2^21421411420 is an apocalyptic number.

21421411420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421411420 is an abundant number, since it is smaller than the sum of its proper divisors (24296243108).

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

21421411420 is a wasteful number, since it uses less digits than its factorization.

21421411420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32850 (or 32848 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21421411420 its reverse (2411412412), we get a palindrome (23832823832).

The spelling of 21421411420 in words is "twenty-one billion, four hundred twenty-one million, four hundred eleven thousand, four hundred twenty".