21480861 has 8 divisors (see below), whose sum is σ = 29565184. Its totient is φ = 13858560.

The previous prime is 21480859. The next prime is 21480863. The reversal of 21480861 is 16808412.

It is an interprime number because it is at equal distance from previous prime (21480859) and next prime (21480863).

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

It is not a de Polignac number, because 21480861 - 2¹ = 21480859 is a prime.

It is a super-2 number, since 2×21480861² = 922854778602642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115396 + ... + 115581.

It is an arithmetic number, because the mean of its divisors is an integer number (3695648).

Almost surely, 2^21480861 is an apocalyptic number.

It is an amenable number.

21480861 is a deficient number, since it is larger than the sum of its proper divisors (8084323).

21480861 is a wasteful number, since it uses less digits than its factorization.

21480861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231011.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 21480861 is about 4634.7449768029. The cubic root of 21480861 is about 277.9823540030.

The spelling of 21480861 in words is "twenty-one million, four hundred eighty thousand, eight hundred sixty-one".