21480773 has 8 divisors (see below), whose sum is σ = 22867200. Its totient is φ = 20119968.

The previous prime is 21480763. The next prime is 21480791. The reversal of 21480773 is 37708412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21480773 - 2¹⁸ = 21218629 is a prime.

It is a super-2 number, since 2×21480773² = 922847217355058, 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 (21480713) 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, 4661 + ... + 8042.

It is an arithmetic number, because the mean of its divisors is an integer number (2858400).

Almost surely, 2^21480773 is an apocalyptic number.

It is an amenable number.

21480773 is a deficient number, since it is larger than the sum of its proper divisors (1386427).

21480773 is a wasteful number, since it uses less digits than its factorization.

21480773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12811.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 21480773 is about 4634.7354832827. The cubic root of 21480773 is about 277.9819744019.

The spelling of 21480773 in words is "twenty-one million, four hundred eighty thousand, seven hundred seventy-three".