21480026 has 8 divisors (see below), whose sum is σ = 32406804. Its totient is φ = 10677760.

The previous prime is 21480007. The next prime is 21480049. The reversal of 21480026 is 62008412.

It can be written as a sum of positive squares in 2 ways, for example, as 21390625 + 89401 = 4625^2 + 299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21480026² = 922783033921352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21479983 and 21480010.

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, 30695 + ... + 31386.

Almost surely, 2^21480026 is an apocalyptic number.

21480026 is a deficient number, since it is larger than the sum of its proper divisors (10926778).

21480026 is a wasteful number, since it uses less digits than its factorization.

21480026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62256.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21480026 is about 4634.6548954588. The cubic root of 21480026 is about 277.9787520637.

Adding to 21480026 its reverse (62008412), we get a palindrome (83488438).

The spelling of 21480026 in words is "twenty-one million, four hundred eighty thousand, twenty-six".