21053417 has 16 divisors (see below), whose sum is σ = 26625024. Its totient is φ = 16170000.

The previous prime is 21053411. The next prime is 21053437. The reversal of 21053417 is 71435012.

It is not a de Polignac number, because 21053417 - 2⁶ = 21053353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21053392 and 21053401.

It is not an unprimeable number, because it can be changed into a prime (21053411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3542 + ... + 7392.

It is an arithmetic number, because the mean of its divisors is an integer number (1664064).

Almost surely, 2^21053417 is an apocalyptic number.

It is an amenable number.

21053417 is a deficient number, since it is larger than the sum of its proper divisors (5571607).

21053417 is a wasteful number, since it uses less digits than its factorization.

21053417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21053417 is about 4588.4002658879. The cubic root of 21053417 is about 276.1261456900.

Adding to 21053417 its reverse (71435012), we get a palindrome (92488429).

The spelling of 21053417 in words is "twenty-one million, fifty-three thousand, four hundred seventeen".