21407053 has 12 divisors (see below), whose sum is σ = 23187360. Its totient is φ = 19708272.

The previous prime is 21407041. The next prime is 21407093. The reversal of 21407053 is 35070412.

It is not a de Polignac number, because 21407053 - 2⁵ = 21407021 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 (21407033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25600 + ... + 26422.

It is an arithmetic number, because the mean of its divisors is an integer number (1932280).

Almost surely, 2^21407053 is an apocalyptic number.

It is an amenable number.

21407053 is a deficient number, since it is larger than the sum of its proper divisors (1780307).

21407053 is an equidigital number, since it uses as much as digits as its factorization.

21407053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21407053 is about 4626.7756591389. The cubic root of 21407053 is about 277.6636072259.

Adding to 21407053 its reverse (35070412), we get a palindrome (56477465).

The spelling of 21407053 in words is "twenty-one million, four hundred seven thousand, fifty-three".