21481030 has 16 divisors (see below), whose sum is σ = 40940640. Its totient is φ = 8086912.

The previous prime is 21481003. The next prime is 21481049. The reversal of 21481030 is 3018412.

It is a super-2 number, since 2×21481030² = 922869299721800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21480989 and 21481007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63010 + ... + 63349.

It is an arithmetic number, because the mean of its divisors is an integer number (2558790).

Almost surely, 2^21481030 is an apocalyptic number.

21481030 is a deficient number, since it is larger than the sum of its proper divisors (19459610).

21481030 is a wasteful number, since it uses less digits than its factorization.

21481030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126383.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21481030 is about 4634.7632086224. The cubic root of 21481030 is about 277.9830830069.

Adding to 21481030 its reverse (3018412), we get a palindrome (24499442).

It can be divided in two parts, 214810 and 30, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 21481030 in words is "twenty-one million, four hundred eighty-one thousand, thirty".