21700052 has 48 divisors (see below), whose sum is σ = 44210880. Its totient is φ = 9216000.

The previous prime is 21700043. The next prime is 21700057. The reversal of 21700052 is 25000712.

It is a self number, because there is not a number n which added to its sum of digits gives 21700052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700057) 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 15 ways as a sum of consecutive naturals, for example, 84308 + ... + 84564.

It is an arithmetic number, because the mean of its divisors is an integer number (921060).

Almost surely, 2^21700052 is an apocalyptic number.

21700052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21700052 is an abundant number, since it is smaller than the sum of its proper divisors (22510828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21700052 is a wasteful number, since it uses less digits than its factorization.

21700052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 21700052 is about 4658.3314609418. The cubic root of 21700052 is about 278.9246680221.

Adding to 21700052 its reverse (25000712), we get a palindrome (46700764).

The spelling of 21700052 in words is "twenty-one million, seven hundred thousand, fifty-two".