21410020 has 12 divisors (see below), whose sum is σ = 44961084. Its totient is φ = 8564000.

The previous prime is 21410009. The next prime is 21410023. The reversal of 21410020 is 2001412.

It can be written as a sum of positive squares in 2 ways, for example, as 3211264 + 18198756 = 1792^2 + 4266^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21409979 and 21410006.

It is not an unprimeable number, because it can be changed into a prime (21410023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535231 + ... + 535270.

It is an arithmetic number, because the mean of its divisors is an integer number (3746757).

Almost surely, 2^21410020 is an apocalyptic number.

21410020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21410020 is an abundant number, since it is smaller than the sum of its proper divisors (23551064).

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

21410020 is a wasteful number, since it uses less digits than its factorization.

21410020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070510 (or 1070508 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21410020 is about 4627.0962816868. The cubic root of 21410020 is about 277.6764346161.

Adding to 21410020 its reverse (2001412), we get a palindrome (23411432).

The spelling of 21410020 in words is "twenty-one million, four hundred ten thousand, twenty".