21461085 has 32 divisors (see below), whose sum is σ = 39050880. Its totient is φ = 11176704.

The previous prime is 21461053. The next prime is 21461087. The reversal of 21461085 is 58016412.

It is not a de Polignac number, because 21461085 - 2⁵ = 21461053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3957 + ... + 7653.

It is an arithmetic number, because the mean of its divisors is an integer number (1220340).

Almost surely, 2^21461085 is an apocalyptic number.

It is an amenable number.

21461085 is a deficient number, since it is larger than the sum of its proper divisors (17589795).

21461085 is a wasteful number, since it uses less digits than its factorization.

21461085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3754 (or 3748 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21461085 is about 4632.6110348269. The cubic root of 21461085 is about 277.8970211895.

Adding to 21461085 its reverse (58016412), we get a palindrome (79477497).

The spelling of 21461085 in words is "twenty-one million, four hundred sixty-one thousand, eighty-five".