21701053 has 4 divisors (see below), whose sum is σ = 23673888. Its totient is φ = 19728220.

The previous prime is 21701051. The next prime is 21701083. The reversal of 21701053 is 35010712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21701053 - 2¹ = 21701051 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 21701053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701051) 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 3 ways as a sum of consecutive naturals, for example, 986401 + ... + 986422.

It is an arithmetic number, because the mean of its divisors is an integer number (5918472).

Almost surely, 2^21701053 is an apocalyptic number.

It is an amenable number.

21701053 is a deficient number, since it is larger than the sum of its proper divisors (1972835).

21701053 is a wasteful number, since it uses less digits than its factorization.

21701053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972834.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 21701053 is about 4658.4389016064. The cubic root of 21701053 is about 278.9289567876.

Adding to 21701053 its reverse (35010712), we get a palindrome (56711765).

It can be divided in two parts, 2170 and 1053, that added together give a palindrome (3223).

The spelling of 21701053 in words is "twenty-one million, seven hundred one thousand, fifty-three".