21350481 has 8 divisors (see below), whose sum is σ = 28868544. Its totient is φ = 14033040.

The previous prime is 21350479. The next prime is 21350501. The reversal of 21350481 is 18405312.

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

It is not a de Polignac number, because 21350481 - 2¹ = 21350479 is a prime.

It is a super-2 number, since 2×21350481² = 911686077862722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21350401) 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, 49906 + ... + 50331.

It is an arithmetic number, because the mean of its divisors is an integer number (3608568).

Almost surely, 2^21350481 is an apocalyptic number.

It is an amenable number.

21350481 is a deficient number, since it is larger than the sum of its proper divisors (7518063).

21350481 is a wasteful number, since it uses less digits than its factorization.

21350481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100311.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21350481 is about 4620.6580700156. The cubic root of 21350481 is about 277.4187993893.

Adding to 21350481 its reverse (18405312), we get a palindrome (39755793).

The spelling of 21350481 in words is "twenty-one million, three hundred fifty thousand, four hundred eighty-one".