21602053 has 16 divisors (see below), whose sum is σ = 25099200. Its totient is φ = 18374400.

The previous prime is 21602041. The next prime is 21602059. The reversal of 21602053 is 35020612.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21602053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21602053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602059) 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, 61723 + ... + 62071.

It is an arithmetic number, because the mean of its divisors is an integer number (1568700).

Almost surely, 2^21602053 is an apocalyptic number.

It is an amenable number.

21602053 is a deficient number, since it is larger than the sum of its proper divisors (3497147).

21602053 is a wasteful number, since it uses less digits than its factorization.

21602053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21602053 is about 4647.8008778346. The cubic root of 21602053 is about 278.5041530538.

Adding to 21602053 its reverse (35020612), we get a palindrome (56622665).

The spelling of 21602053 in words is "twenty-one million, six hundred two thousand, fifty-three".