21034461 has 32 divisors (see below), whose sum is σ = 33587200. Its totient is φ = 11456640.

The previous prime is 21034421. The next prime is 21034471. The reversal of 21034461 is 16443012.

It is not a de Polignac number, because 21034461 - 2¹⁵ = 21001693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034411) 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, 51225 + ... + 51633.

It is an arithmetic number, because the mean of its divisors is an integer number (1049600).

Almost surely, 2^21034461 is an apocalyptic number.

21034461 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21034461 is a deficient number, since it is larger than the sum of its proper divisors (12552739).

21034461 is a wasteful number, since it uses less digits than its factorization.

21034461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21034461 is about 4586.3341570365. The cubic root of 21034461 is about 276.0432483162.

Adding to 21034461 its reverse (16443012), we get a palindrome (37477473).

The spelling of 21034461 in words is "twenty-one million, thirty-four thousand, four hundred sixty-one".