21061453 has 24 divisors (see below), whose sum is σ = 26524800. Its totient is φ = 16359168.

The previous prime is 21061451. The next prime is 21061459. The reversal of 21061453 is 35416012.

It is not a de Polignac number, because 21061453 - 2¹ = 21061451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58488 + ... + 58846.

It is an arithmetic number, because the mean of its divisors is an integer number (1105200).

Almost surely, 2^21061453 is an apocalyptic number.

It is an amenable number.

21061453 is a deficient number, since it is larger than the sum of its proper divisors (5463347).

21061453 is a wasteful number, since it uses less digits than its factorization.

21061453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21061453 is about 4589.2758688054. The cubic root of 21061453 is about 276.1612732807.

Adding to 21061453 its reverse (35416012), we get a palindrome (56477465).

The spelling of 21061453 in words is "twenty-one million, sixty-one thousand, four hundred fifty-three".